Question

Mark (✓) against the correct answer:
3 + 23x − 8x² = ?
(a) (1 − 8x)(3 + x)
(b) (1 + 8x)(3 − x)
(c) (1 − 8x)(3 − x)
(d) none of these

Answer 1

(b) $\left(1+8x\right)\left(3-x\right)$

$$\begin{gathered} 3+23x-8x^2 \\ =3+24x-x-8x^2 \\ =3\left(1+8x\right)-x\left(1+8x\right) \\ =\left(1+8x\right)\left(3-x\right) \end{gathered}$$