# How do you factor 3x^2+21x^4?

Apr 30, 2018

$3 {x}^{2} \left(1 + 7 {x}^{2}\right)$

#### Explanation:

Factorising means you take out all the common numbers and symbols

$3 {x}^{2} + 21 {x}^{4}$ = $3 {x}^{2} \left(1 + 7 {x}^{2}\right)$

Apr 30, 2018

$3 {x}^{2} \left(1 + 7 {x}^{2}\right)$

#### Explanation:

The GCF of the two terms is $3 {x}^{2}$

Use the distributive property:

$3 {x}^{2} \left(1 + 7 {x}^{2}\right)$

The expression cannot be factored out anymore.