Question

Evaluate 89×91 with the help of algebraic identity

Answer 1

Step-by-step explanation:

$89 \times 91$

$(90 - 1) \times (90 + 1)$

$identity \: = {a}^{2} - {b}^{2} = (a + b)(a - b)$

${(90)}^{2} - {(1)}^{2}$

$8100 - 1$

$8099$

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MARK BRAINLIEST PLS

Answer 2

Step-by-step explanation:

$89×91</p><p></p><p>(90 - 1) \times (90 + 1)(90−1)×(90+1)</p><p></p><p>identity \: = {a}^{2} - {b}^{2} = (a + b)(a - b)identity=a2−b2=(a+b)(a−b)</p><p></p><p>{(90)}^{2} - {(1)}^{2}(90)2−(1)2</p><p></p><p>8100 - 18100−1</p><p></p><p>80998099</p><p></p><p>$

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