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Question

Factorise: 25a2−36b2

A
(5a - 6b)(5a + 6b)
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B
(5a - 6b)(5a - 6b)
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C
(5a + 6b)(5a + 6b)
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D
(6b - 5a)(6b + 5a)
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Solution

The correct option is B (5a - 6b)(5a - 6b)
The given expression is 25a236b2
= (5a)2(6b)2
= (5a6b)(5a+6b)
[Using the identity a2b2=(a+b)(ab)]

Hence, 25a236b2 = (5a6b)(5a+6b)

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