(x + a) (x + b) = x2 + (a + b) x + _______

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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

(x + a) (x + b) = x2 + (a + b) x + ________.