Question

If (x²+kx-3)=(x-3)(x+1), then k=?

Answer 1

x^2 + kx -3 = (x-3) (x+1)
x^2 +kx -3 = x^2 +x -3x -3
x^2 -x^2 + kx -3 = -2x -3
kx -3 = -2x-3
kx = -2x
k = -2

Hope it helps.