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131.

Using identities, evaluate:

998²

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132.

Using identities, evaluate:

5.2²

147 Views

∵ 297 = 300 - 3 and 303 = 300 + 3

∴   297 x 303 = (300 - 3) (300 + 3)
              = (300)²- (3)²    [Using (a + b)(a - b) = a²-b²]
              = 90000 - 9
              = 89991

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)}

146 Views

137.

Using identities, evaluate:

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

651 Views

138.

Using a² – b² = (a + b)(a – b), find:

51²- 49²

117 Views

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