The polynomial x^2+x-20 is exactly divisible by:
A.x-5
B.x+4
C.x-4
D.x-10
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Step-by-step explanation:
=x^2+x-20
= x^2+5x-4x-20
=x(x+5)-4(x+5)
=(x+5)(x-4)
given polynomial will be divisible by (x-4)
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