### Home > PC > Chapter 11 > Lesson 11.1.4 > Problem11-60

11-60.

Solve for $c$:$c^{4} − 12c^{2} − 64 = 0$.

Factor.

$\left(c^2 ± ?\right)\left(c^2 ± ?\right) = 0$

The original equation has $c^{4}$, so you should be looking for $4$ solutions.