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प्रश्न
Factorise the following:
9x2 – 12x + 4
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उत्तर
9x2 – 12x + 4 = (3x)2 – 2 × 3x × 2 + (2)2
= (3x – 2)2 ...[Using identity, (a – b)2 = a2 – 2ab + b2]
= (3x – 2)(3x – 2)
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