Question

Factorise:
x² + 20x – 69

Answer 1

$$\begin{gathered} x^2+20x-69 \\ =x^2+23x-3x-69 \\ =x\left(x+23\right)-3\left(x+23\right) \\ =\left(x+23\right)\left(x-3\right) \end{gathered}$$