m^4-7m^2-18=0

Solution for m^4-7m^2-18=0 equation:

Simplifying
m4 + -7m2 + -18 = 0

Reorder the terms:
-18 + -7m2 + m4 = 0

Solving
-18 + -7m2 + m4 = 0

Solving for variable 'm'.

Factor a trinomial.
(-2 + -1m2)(9 + -1m2) = 0

Factor a difference between two squares.
(-2 + -1m2)((3 + m)(3 + -1m)) = 0

Subproblem 1
Set the factor '(-2 + -1m2)' equal to zero and attempt to solve:

Simplifying
-2 + -1m2 = 0

Solving
-2 + -1m2 = 0

Move all terms containing m to the left, all other terms to the right.

Add '2' to each side of the equation.
-2 + 2 + -1m2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -1m2 = 0 + 2
-1m2 = 0 + 2

Combine like terms: 0 + 2 = 2
-1m2 = 2

Divide each side by '-1'.
m2 = -2

Simplifying
m2 = -2

The solution to this equation could not be determined.

This subproblem is being ignored because a solution could not be determined.
Subproblem 2
Set the factor '(3 + m)' equal to zero and attempt to solve:

Simplifying
3 + m = 0

Solving
3 + m = 0

Move all terms containing m to the left, all other terms to the right.

Add '-3' to each side of the equation.
3 + -3 + m = 0 + -3

Combine like terms: 3 + -3 = 0
0 + m = 0 + -3
m = 0 + -3

Combine like terms: 0 + -3 = -3
m = -3

Simplifying
m = -3
Subproblem 3
Set the factor '(3 + -1m)' equal to zero and attempt to solve:

Simplifying
3 + -1m = 0

Solving
3 + -1m = 0

Move all terms containing m to the left, all other terms to the right.

Add '-3' to each side of the equation.
3 + -3 + -1m = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -1m = 0 + -3
-1m = 0 + -3

Combine like terms: 0 + -3 = -3
-1m = -3

Divide each side by '-1'.
m = 3

Simplifying
m = 3
Solution
m = {-3, 3}