# How do you solve #4x^4 - 16x^2 + 15 = 0#?

##### 1 Answer

May 3, 2018

#### Explanation:

for real coefficient equation

equation of n‐th degree exist n roots

so this equations exists 3 possible answers

1. two pairs of the complex conjugate of

2. a pair of the complex conjugate of

3. four real roots

first I guess I can use "Cross method" to factorizative this equation

it can be seen as below

so there are four real roots