Using (x + a) (x + b) find (3x + 5) (3x – 7)
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we know (x+a)(x+b) = x² + x(a+b) + ab
(3x + 5)(3x - 7) = (3x)² + 3x(5 - 7) + 5 × -7
= 9x² - 6x - 35
Answer = 9x² - 6x - 35
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