0=5x^4-90x^2

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Solution for 0=5x^4-90x^2 equation:


Simplifying
0 = 5x4 + -90x2

Reorder the terms:
0 = -90x2 + 5x4

Solving
0 = -90x2 + 5x4

Solving for variable 'x'.
Remove the zero:
90x2 + -5x4 = -90x2 + 5x4 + 90x2 + -5x4

Reorder the terms:
90x2 + -5x4 = -90x2 + 90x2 + 5x4 + -5x4

Combine like terms: -90x2 + 90x2 = 0
90x2 + -5x4 = 0 + 5x4 + -5x4
90x2 + -5x4 = 5x4 + -5x4

Combine like terms: 5x4 + -5x4 = 0
90x2 + -5x4 = 0

Factor out the Greatest Common Factor (GCF), '5x2'.
5x2(18 + -1x2) = 0

Ignore the factor 5.

Subproblem 1

Set the factor 'x2' equal to zero and attempt to solve: Simplifying x2 = 0 Solving x2 = 0 Move all terms containing x to the left, all other terms to the right. Simplifying x2 = 0 Take the square root of each side: x = {0}

Subproblem 2

Set the factor '(18 + -1x2)' equal to zero and attempt to solve: Simplifying 18 + -1x2 = 0 Solving 18 + -1x2 = 0 Move all terms containing x to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + -1x2 = 0 + -18 Combine like terms: 18 + -18 = 0 0 + -1x2 = 0 + -18 -1x2 = 0 + -18 Combine like terms: 0 + -18 = -18 -1x2 = -18 Divide each side by '-1'. x2 = 18 Simplifying x2 = 18 Take the square root of each side: x = {-4.242640687, 4.242640687}

Solution

x = {0, -4.242640687, 4.242640687}

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