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Question

Factorise: x2- 81



A

(x+9)(x+9)

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B

(x-9)(x-9) (x-9)(x-9)

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C

(x-9)(x+9)

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D

(x-81)(x+1)

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Solution

The correct option is B

(x-9)(x+9)


By using the square identity (x2- y2) = (x-y) (x +y), we get

So, x2- 81 = (x-9)(x+9)


Mathematics

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