Question

dentify the factors of x2 − 4x − 21.

Answer 1

SOLUTION

Identify the factors of x2 − 4x − 21.

$x^2-4x-21$

Factorise the equation

$\begin{gathered} x^2-4x-21 \\ x^2+3x-7x-21 \\ x(x+3)-7(x+3) \\ (x+3)(x-7) \end{gathered}$

The solutions of the equation

$(x+3)(x-7)$