80a^4-280a^2+245=0

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Solution for 80a^4-280a^2+245=0 equation:


Simplifying
80a4 + -280a2 + 245 = 0

Reorder the terms:
245 + -280a2 + 80a4 = 0

Solving
245 + -280a2 + 80a4 = 0

Solving for variable 'a'.

Factor out the Greatest Common Factor (GCF), '5'.
5(49 + -56a2 + 16a4) = 0

Factor a trinomial.
5((7 + -4a2)(7 + -4a2)) = 0

Ignore the factor 5.

Subproblem 1

Set the factor '(7 + -4a2)' equal to zero and attempt to solve: Simplifying 7 + -4a2 = 0 Solving 7 + -4a2 = 0 Move all terms containing a to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -4a2 = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -4a2 = 0 + -7 -4a2 = 0 + -7 Combine like terms: 0 + -7 = -7 -4a2 = -7 Divide each side by '-4'. a2 = 1.75 Simplifying a2 = 1.75 Take the square root of each side: a = {-1.322875656, 1.322875656}

Subproblem 2

Set the factor '(7 + -4a2)' equal to zero and attempt to solve: Simplifying 7 + -4a2 = 0 Solving 7 + -4a2 = 0 Move all terms containing a to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -4a2 = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -4a2 = 0 + -7 -4a2 = 0 + -7 Combine like terms: 0 + -7 = -7 -4a2 = -7 Divide each side by '-4'. a2 = 1.75 Simplifying a2 = 1.75 Take the square root of each side: a = {-1.322875656, 1.322875656}

Solution

a = {-1.322875656, 1.322875656, -1.322875656, 1.322875656}

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