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Algebraic Expressions and Identities

Short Answer Type

131.

Using identities, evaluate:

998²

160 Views

132.

Using identities, evaluate:

5.2²

147 Views

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}

∵ 8.9 = (9 - 0.1)

∴ (8.9)² = (9- 0.1) (80 + 2)
                = (9)²- 2(9)(0.1) + (0.1)² [Using (a + b)(a - b) = a²- b²]
                = 6400 - 4
                = 6396

94 Views

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

Previous Year Papers

Test Series

Test Yourself

Short Answer Type

135. Using identities, evaluate:78 x 82

135.
Using identities, evaluate:

^{78 x 82}