Find the value of  from Mathematics Binomial Theorem

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 Multiple Choice QuestionsShort Answer Type

11.

Find left parenthesis straight a plus straight b right parenthesis to the power of 4 minus left parenthesis straight a minus straight b right parenthesis to the power of 4. then evaluate space space left parenthesis square root of 3 plus square root of 2 right parenthesis to the power of 4 minus left parenthesis square root of 3 minus square root of 2 right parenthesis to the power of 4

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12.

Find left parenthesis straight x plus 1 right parenthesis to the power of 5 plus left parenthesis straight x minus 1 right parenthesis to the power of 5 and hence evaluate left parenthesis square root of 2 plus 1 right parenthesis to the power of 5 plus space left parenthesis square root of 2 minus 1 right parenthesis to the power of 5

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13.

Simplify: left parenthesis straight x plus 2 straight y right parenthesis to the power of 10 plus left parenthesis straight x minus 2 straight y right parenthesis to the power of 10

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14. Show that 9n + 1 - 8n - 9 is divisible by 64, whenever n is a positive integer. 
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15. Using Binomial Theorem, prove that 6n - 5n always leaves remainder 1 when divided by 25.
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16.

Find the value of space space open parentheses straight a squared plus square root of straight a squared minus 1 end root close parentheses to the power of 4 plus open parentheses straight a squared minus square root of straight a squared minus 1 end root close parentheses to the power of 4


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∴   left parenthesis straight a squared plus square root of straight a squared minus 1 end root right parenthesis to the power of 4 plus left parenthesis straight a squared minus square root of straight a squared minus 1 right parenthesis end root to the power of 4 equals space left parenthesis straight x plus straight y right parenthesis to the power of 4 plus left parenthesis straight x minus straight y right parenthesis to the power of 4
                                  equals left square bracket straight C presuperscript 4 subscript 0 space straight x to the power of 4 straight y to the power of 0 plus straight C presuperscript 4 subscript 1 space straight x cubed straight y plus straight C presuperscript 4 subscript 2 space straight x squared straight y squared plus straight C presuperscript 4 subscript 3 space xy cubed plus straight C presuperscript 4 subscript 4 space straight x to the power of 0 straight y to the power of 4 right square bracket
                                              plus left square bracket straight C presuperscript 4 subscript 0 space end subscript straight x to the power of 4 straight y to the power of 0 minus straight C presuperscript 4 subscript 1 space straight x cubed straight y plus straight C presuperscript 4 subscript 2 space straight x squared straight y squared plus straight C presuperscript 4 subscript 3 space xy cubed space plus space straight C presuperscript 4 subscript 4 space end subscript straight x to the power of 0 straight y to the power of 4 right square bracket
                                  equals 2 space left square bracket straight C presuperscript 4 subscript 0 space straight x to the power of 4 straight y to the power of 0 plus straight C presuperscript 4 subscript 2 space straight x squared straight y squared plus space straight C presuperscript 4 subscript 4 space straight x to the power of 0 straight y to the power of 4 right square bracket
                                  equals space 2 space open square brackets straight x to the power of 4 plus 6 straight x squared straight y squared plus straight y to the power of 4 close square brackets
 
                                  equals space 2 open square brackets left parenthesis straight a squared right parenthesis to the power of 4 plus 6 left parenthesis straight a squared right parenthesis squared space left parenthesis square root of straight a squared minus 1 end root right parenthesis squared plus left parenthesis square root of straight a squared minus 1 right parenthesis end root to the power of 4 close square brackets [By replacing again x by a2 and y by                                                                                                                                                        square root of straight a squared minus 1 end root]
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                                  equals space 2 left square bracket straight a to the power of 8 plus 6 straight a to the power of 6 minus 6 straight a to the power of 4 plus straight a to the power of 4 minus 2 straight a squared plus 1 right square bracket
                                  equals 2 left square bracket straight a to the power of 8 plus 6 straight a to the power of 6 minus 5 straight a to the power of 4 minus 2 straight a squared plus 1 right square bracket

                                    
 
        

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17. Find the expansion of (3x2 - 2ax + 3a2)3 using binomial theorem. 
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18. If a and b are distinct integers, prove that a-b is a factor of an - bn, whenever n is positive integer.
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19. Find co-efficient of x5 in the expansion of (1 + 3x)6 (1 - x)5
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20. In the expansion of (x + a)n, sums of odd and even terms are P and Q respectively. 
Prove that:

(a) 2 left parenthesis straight P squared plus straight Q squared right parenthesis space equals space left parenthesis straight x plus straight a right parenthesis to the power of 2 straight n end exponent plus left parenthesis straight x minus straight a right parenthesis to the power of 2 straight n end exponent  (b) left parenthesis straight P squared minus straight Q squared right parenthesis space equals space left parenthesis straight x squared minus straight a squared right parenthesis to the power of straight n
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