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प्रश्न
Factorise the following algebraic expression by using the identity a2 – b2 = (a + b)(a – b)
9 – 4y2
उत्तर
9 – 4y2 = 32 – 22y2
= 32 – (2y)2
let a = 3 and b = 2y, then
a2 – b2 = (a + b)(a – b)
∴ 32 – (2y)2 = (3 + 2y)(3 – 2y)
9 – 4y2 = (3 + 2y)(3 – 2y)
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