(5 x-7) (5 x - 9) expand
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5x – 7) (5x – 9) = (5x)2 + (-7 -9) 5x + (-7) × (-9). …[∵ (x + a) (x + b) = x2 + (a + b)x + ab] = 25x2 + (-16) × 5x + 63 = 25x2 – 80x + 63
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