q^4+15=8q^2

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Solution for q^4+15=8q^2 equation:


Simplifying
q4 + 15 = 8q2

Reorder the terms:
15 + q4 = 8q2

Solving
15 + q4 = 8q2

Solving for variable 'q'.

Reorder the terms:
15 + -8q2 + q4 = 8q2 + -8q2

Combine like terms: 8q2 + -8q2 = 0
15 + -8q2 + q4 = 0

Factor a trinomial.
(3 + -1q2)(5 + -1q2) = 0

Subproblem 1

Set the factor '(3 + -1q2)' equal to zero and attempt to solve: Simplifying 3 + -1q2 = 0 Solving 3 + -1q2 = 0 Move all terms containing q to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -1q2 = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1q2 = 0 + -3 -1q2 = 0 + -3 Combine like terms: 0 + -3 = -3 -1q2 = -3 Divide each side by '-1'. q2 = 3 Simplifying q2 = 3 Take the square root of each side: q = {-1.732050808, 1.732050808}

Subproblem 2

Set the factor '(5 + -1q2)' equal to zero and attempt to solve: Simplifying 5 + -1q2 = 0 Solving 5 + -1q2 = 0 Move all terms containing q to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -1q2 = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -1q2 = 0 + -5 -1q2 = 0 + -5 Combine like terms: 0 + -5 = -5 -1q2 = -5 Divide each side by '-1'. q2 = 5 Simplifying q2 = 5 Take the square root of each side: q = {-2.236067978, 2.236067978}

Solution

q = {-1.732050808, 1.732050808, -2.236067978, 2.236067978}

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