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प्रश्न
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
x2 – 9
उत्तर
We have,
x2 – 9 = x2 – 32 ...[∵ a2 – b2 = (a – b)(a + b)]
= (x – 3)(x + 3)
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