Question

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Answer 1

hey dude its your solution .......

zero of x+4 is -4 ok...

f(x)=
$x ^{3} + 15x^{2} + 9x - a$
f(-4)= -4^3+15×-4^2+9×-4-a
f(-4)= -64-60+16-36-a =0

f(-4)= -144-a=0

a=-144 @nswer