Question

if X + kx – 15 = (x - 3)(x + 5) for all x, then the value of k is
(1) -2
(2) 2
(3) 0
(4) 8​

Answer 1

Step-by-step explanation:

x+kx-15 =(x-3)(x+5)

x+kx-15 = x²+5x-3x-15

x+kx = x²+2x

x²+2x-x-kx=0

x²+x-kx=0

x²-kx+x =0

x(x-k+1)=0

x-k+1=0

-k= -x-1

k =x-1

I hope it helps u