Question

Find the Factors of the Polynomial Given Below.

2x² + x – 1

Answer 1

2x² + x – 1 

= 2x² + 2x - x - 1            ...$$\begin{array}{c}2\times \text{-}1=-2\\ \phantom{..........}/\mathrm{\setminus }\\ \phantom{...........}2\phantom{..}-1\phantom{}\end{array}$$

= 2x (x + 1) - 1(x + 1)

= (x + 1) (2x - 1)