Question

how do you solve x^4+13x^2=-36?

Answer 1

Factor it.

Answer 2

\[(x^2+9)(x^2+4)=0\]

Answer 3

Now set each factor equal to zero and solve.

Answer 4

\[x^2=-9\]

\[x=\pm 3i\]
\[x^2=-4\]

Answer 5

\[x=\pm2i\]

Answer 6

is x=+-2i the answer?

Answer 7

Did you read what I wrote? There are 4 answers.

Answer 8

x to the fourth power means you have 4 solutions