Question

If (x² + kx − 3) = (x − 3) (x + 1), then k = ?
(a) 2
(b) −2
(c) 3
(d) −1

Answer 1

(b) −2

$\left(x-3\right)\left(x+1\right)=x^2-2x-3$
Thus, we have:
$$\begin{gathered} x^2+kx-3=x^2-2x-3 \\ \Rightarrow k=-2 \end{gathered}$$