Question

Check whether x + 3 is a factor of x^ - 4x – 21

Answer 1

Answer:

yes it is

Step-by-step explanation:

by middle term splitting -7 and 3

Answer 2

Step-by-step explanation:

g(x)= x + 3

x = -3

$f(x) = {x}^{2} - 4x - 21 \\ f( - 3) = ({ - 3})^{2} - 4( - 3) - 21 \\ = 9 + 12 - 21 \\ = 21 - 21 \\ = 0$

Hence x-3 is a factor of given equation..

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