Question

B. Multiply (3 x - 1) by (x + 1)​

Answer 1

(3x - 1)(x + 1) = 3x² + 2x - 1

Explanation:

got it right on edge

Answer 2

(3x - 1)(x + 1) = 3x² + 2x - 1

Step-by-step explanation:

`\rm \longrightarrow (3x - 1)(x + 1) \\ \\ \rm \longrightarrow 3x(x + 1) - 1(x + 1) \\ \\ \rm \longrightarrow (3x)(x) + (3x)(1) + ( - 1)(x) + ( - 1)(1) \\ \\ \rm \longrightarrow 3 {x}^(2) + 3x + ( - x ) + ( - 1) \\ \\ \rm \longrightarrow 3 {x}^(2) + 3x - x - 1 \\ \\ \rm \longrightarrow 3 {x}^(2) + 2x - 1`