For what value of,K the factor of x^2 + x-(2K+2)and 2x^2 + Kx-12 is x+4?

CBSE Class 9 CBSE Class 9 Maths
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1

For what value of,K the factor of x2 + x-(2K+2) and 2x2 + Kx-12 is x+4?

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(1) x2+x-(2K+2)
it has x+4 as factor which means x+4 is a root of this equation so
substituting 4 in the equation will make it 0
16+4-(2K+2)=0
K=9
(2)2x2+ Kx-12 has factor x+4 which means x+4 is a root of this equation so
substituting 4 in the equation will make it 0
2(4)2 + K(4)-12 =0
K=5