Question

11. Using suitable identities, evaluate the following: (i) 87²-13²
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Answer 1

Step-by-step explanation:

(87-13)×(87+14)=74×101=7474

Answer 2

Answer:

7400

Step-by-step explanation:

By Using,

$\boxed{\tt a^2 - b^2 = (a+b)(a-b)}$

We have,

$\tt 87^2-13^2$

$\tt \implies (87+13)(87-13)$

$\tt \implies (100)(74)$

$\tt \implies 7400$