Solve for x: from Mathematics Quadratic Equations

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 Multiple Choice QuestionsMultiple Choice Questions

341. If one root of the quadratic equation 2x2 – 3x + P = 0 is 3, then the other root is
  • 3 over 2
  • negative 3 over 2
  • 1 half
  • 1 half
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342. If you divide 29 into two parts so that the sum of the squares of the parts is 425 then the two parts are
  • 13, 15 
  • 16, 15
  • 13, 16
  • 13, 16
197 Views

343. For what value of a the quadratic equation (a - 4)x2 + 2(α – 4)x + 4 = 0, has equal roots.
  • α = 7
  • α = 5
  • α = 4
  • α = 4
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344. The two consecutive positive integers, sum of whose square is 365 are
  • 13, 14
  • 12, 13 
  • 11, 12
  • 11, 12
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345. One of the root of a quadratic equation space square root of 2 straight x squared plus 7 straight x plus 5 square root of 2 space equals space 0
  • space fraction numerator negative 5 over denominator square root of 2 end fraction
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346. The discriminant of the quadratic equation 3 straight x squared minus 4 square root of 3 straight x plus 4 equals 0
  • D > 0 
  • D < 0
  • D = 0
  • D = 0
137 Views

 Multiple Choice QuestionsShort Answer Type

347.

If -5 is a root of the quadratic equation 2x2  + px – 15 = 0 and the quadratic equation p(x2 + x)k = 0 has equal roots, find the value of k.

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348.

Solve for x:
fraction numerator 1 over denominator left parenthesis straight x minus 1 right parenthesis left parenthesis straight x minus 2 right parenthesis end fraction plus fraction numerator 1 over denominator left parenthesis straight x minus 2 right parenthesis left parenthesis straight x minus 3 right parenthesis end fraction space equals 2 over 3 comma space straight x not equal to 1 comma 2 comma 3

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349.

Solve for x:

fraction numerator 1 over denominator straight x plus 1 end fraction plus fraction numerator 2 over denominator x plus 2 end fraction plus fraction numerator 4 over denominator x plus 4 end fraction comma space x not equal to negative 1 comma negative 2 comma negative 4


fraction numerator 1 over denominator straight x plus 1 end fraction plus fraction numerator 2 over denominator straight x plus 2 end fraction plus fraction numerator 4 over denominator straight x plus 4 end fraction
straight L. straight C. straight M space of space all space the space denominators space is space left parenthesis straight x plus 1 right parenthesis left parenthesis straight x plus 2 right parenthesis left parenthesis straight x plus 4 right parenthesis
Multiply space throughtoout space by space the space straight L. straight C. straight M space we space get
left parenthesis straight x plus 2 right parenthesis left parenthesis straight x plus 4 right parenthesis plus 2 left parenthesis straight x plus 1 right parenthesis left parenthesis straight x plus 4 right parenthesis space equals 4 left parenthesis straight x plus 1 right parenthesis left parenthesis straight x plus 2 right parenthesis
therefore left parenthesis straight x plus 4 right parenthesis left parenthesis straight x plus 2 plus 2 straight x plus 2 right parenthesis equals 4 left parenthesis straight x squared plus 3 straight x plus 2 right parenthesis
therefore space left parenthesis straight x plus 4 right parenthesis left parenthesis 3 straight x plus 4 right parenthesis space equals 4 straight x squared plus 12 straight x space plus 8
therefore space 3 straight x squared plus 16 straight x plus 16 space equals space 4 straight x squared plus 12 straight x plus 8
therefore space straight x squared minus 4 straight x minus 8 equals 0
Now space straight a comma space equals 1 space straight b equals negative 4 comma space straight c equals negative 8
straight x equals fraction numerator negative straight b begin display style plus for minus of end style square root of straight b squared minus 4 ac end root over denominator 2 straight a end fraction equals fraction numerator 4 plus for minus of square root of 16 plus 32 end root over denominator 2 end fraction space equals fraction numerator 4 plus for minus of square root of 48 over denominator 2 end fraction space
equals fraction numerator 4 plus for minus of 4 square root of 3 over denominator 2 end fraction space
straight x equals 2 plus for minus of 2 square root of 3
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350.

If the quadratic equation haspx squared minus 2 square root of 5px plus 15 equals 0 two roots, then find the value of p.

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