Question:
(x + a) (x + b) = x2 + (a + b) x + ________.
Solution:
(x + a) (x + b) = x2 + (a + b) x + ab
= (x + a) (x + b)
= x × (x + b) + a × (x + b)
= x2 + xb + xa + ab
= x2 + x (b + a) + ab
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