Question

factorize: ^2 - 81
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Answer 1

We have to factorise x2−81

We will use identity a2−b2=(a−b)(a+b)

It can be written as x2−81=(x+9)(x−9)

Thus factors are (x+9),(x−9).

Answer 2

Correct Question ⤵

Factorise: x² - 81

Correct Answer

x² - 81

= x² - 9²

Use a² - b² = (a-b) (a+b)

Answer - (x - 9 ) × (x+9 )