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Factorise a^(2)-9b^(2)....

Factorise `a^(2)-9b^(2)`.

A

(a+3b)(a+3b)

B

(a+3b)(a-3b)

C

(a-3b)(a-3b)

D

(a+5b)(a-3b)

Text Solution

Verified by Experts

The correct Answer is:
B
Given expression : `a^(2)=9b^(2)=(a)^(2)-(3b)^(2) " " [because x^(2)-y^(2)=(x+y)(x-y)]`
=(a+3b)(a-3b)
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