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Question
Find the missing term: y2 + (...)x + 56 = (y + 7)(y + ...)
Solution
We have (x + a)(x + b) = x2 + (a + b)x + ab
56 = 7 × 8
∴ y2 + (7 + 8)x + 56 = (y + 7)(y + 8)
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