Evaluate 91 x 95 using algebraic identity.

8121

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8465

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8645

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8961

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Solution

The correct option is C 8645
91 $\times$ 95
= (90 + 1) (90 + 5)
$= 90^{2} + (1 + 5) \times 90 + 1 \times 5 = 8100 + 540 + 5 = 8645$

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When we evaluate using algebraic identity what will we get :

[√(a-x)][√(a+x)]

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