Find the factors.
x2 + 3x – 40
x2 + 3x – 40
⟹ x2 + 8x – 5x – 40
⟹ x(x + 8) – 5(x + 8)
⟹ (x – 5) (x + 8)
So (x – 5) and (x + 8) are the factors of the given polynomial.
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