7x^4=21x^2

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Solution for 7x^4=21x^2 equation:


Simplifying
7x4 = 21x2

Solving
7x4 = 21x2

Solving for variable 'x'.

Reorder the terms:
-21x2 + 7x4 = 21x2 + -21x2

Combine like terms: 21x2 + -21x2 = 0
-21x2 + 7x4 = 0

Factor out the Greatest Common Factor (GCF), '7x2'.
7x2(-3 + x2) = 0

Ignore the factor 7.

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 '(-3 + x2)' equal to zero and attempt to solve: Simplifying -3 + x2 = 0 Solving -3 + x2 = 0 Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x2 = 0 + 3 Combine like terms: -3 + 3 = 0 0 + x2 = 0 + 3 x2 = 0 + 3 Combine like terms: 0 + 3 = 3 x2 = 3 Simplifying x2 = 3 Take the square root of each side: x = {-1.732050808, 1.732050808}

Solution

x = {0, -1.732050808, 1.732050808}

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