### Home > A2C > Chapter 2 > Lesson 2.2.2 > Problem2-142

2-142.

Multiply each pair of functions below to find an expression for $f \left(x\right) · g\left(x\right)$.

1. $f\left(x\right) = 2x, g\left(x\right) = \left(x + 3\right)$

Multiply the expressions.

$\left(2x\right) \left(x + 3\right)$

$2x^{2} + 6x$

1. $f\left(x\right) = \left(x + 3\right), g\left(x\right) = \left(x − 5\right)$

Multiply using a generic rectangle.

1. $f\left(x\right) = \left(2x + 1\right), g\left(x\right) = \left(x − 3\right)$

See part (b).

1. $f\left(x\right) = \left(x + 3\right), g\left(x\right) = \left(x + 3\right)$

See part (b).