### Home > CCG > Chapter 3 > Lesson 3.1.2 > Problem3-21

3-21.

Multiply the expressions below. Then simplify if possible.

1. $2x(3x-4)$

Multiply both terms inside the parentheses by $2x$.

1. $(x+3)(2x-5)$

Use a generic rectangle to multiply every term in the first binomial with every term in the second binomial.

Before simplifying, you should have $4$ terms (see above).

1. $(2x+5)(2x-5)$

See the hint for part (b).

$4x^2-25$

1. $x(2x+1)(x-3)$

It doesn't matter what order you multiply in. Try adding brackets so you don't get confused.

$2x^3-5x^2-3x$