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Find the following products : (2x - 3) (2x - 5) |
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Answer» Using the identity : (x + a) (x + b) = x2 + (a + b) x + ab, we have (2x - 3) (2x + 5) = (y - 3) (y + 5), where y = 2x = {y + (-3)} (y + 5) = y2 + {(-3) + 5} y + (-3) × 5 = y2 + 2y - 15 = (2x)2 + 2 × 2x - 15 = 4x2 + 4x - 15 |
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