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131.

Using identities, evaluate:

998²

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∵ 5.2 = 5 + 0.2

∴ (5.2)²= (5 + 0.2)²
              = (5)²- 2(5)(0.2) + (0.2)²    [Using (a + b)²- 2ab + b²]
              = 25 + 2 + 0.04
              = 27.04

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133.

Using identities, evaluate:

^{297 x 303}

609 Views

134.

Using identities, evaluate:

^{78 x 82}

375 Views

135.

Using identities, evaluate:

^{78 x 82}

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136.

Using identities, evaluate:

^{8.9 = (9 - 0.1)}

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137.

Using identities, evaluate:

^{1.05 = (1 - 0.05) x 9.5}

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138.

Using a² – b² = (a + b)(a – b), find:

51²- 49²

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139.

Using a² – b² = (a + b)(a – b), find:

(1.02)²- (0.98)²

313 Views

140.

Using a² – b² = (a + b)(a – b), find:

153²- 147²

119 Views