Algebramedium · Past Paper
Factorize: x^2 + x - 20
A(x+5)(x-4)
B(x-5)(x+4)
C(x+10)(x-2)
D(x-20)(x+1)
✓ Correct Answer: A — (x+5)(x-4)
+5 and -4 add to +1 and multiply to -20.
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