Answer:
x²+ 5x - 36
Explanation:
Given
(x - 4)(x + 9)
Each term in the second factor is multiplied by each term in the first factor, that is
x(x + 9) - 4(x + 9) ← distribute both parenthesis
= x² + 9x - 4x - 36 ← collect like terms
= x² + 5x - 36
x^2+5x-36
x^2+9x-4x-36
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