Answer:
x² + 19x + 90
Explanation:
(x + 9)(x + 10)
each term in the second factor is multiplied by each term in the first factor, that is
x(x + 10) + 9(x + 10) ← distribute parenthesis
= x² + 10x + 9x + 90 ← collect like terms
= x² + 19x + 90
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