4x^2-12x+9=81

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Solution for 4x^2-12x+9=81 equation:


Simplifying
4x2 + -12x + 9 = 81

Reorder the terms:
9 + -12x + 4x2 = 81

Solving
9 + -12x + 4x2 = 81

Solving for variable 'x'.

Reorder the terms:
9 + -81 + -12x + 4x2 = 81 + -81

Combine like terms: 9 + -81 = -72
-72 + -12x + 4x2 = 81 + -81

Combine like terms: 81 + -81 = 0
-72 + -12x + 4x2 = 0

Factor out the Greatest Common Factor (GCF), '4'.
4(-18 + -3x + x2) = 0

Factor a trinomial.
4((-3 + -1x)(6 + -1x)) = 0

Ignore the factor 4.

Subproblem 1

Set the factor '(-3 + -1x)' equal to zero and attempt to solve: Simplifying -3 + -1x = 0 Solving -3 + -1x = 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 + -1x = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -1x = 0 + 3 -1x = 0 + 3 Combine like terms: 0 + 3 = 3 -1x = 3 Divide each side by '-1'. x = -3 Simplifying x = -3

Subproblem 2

Set the factor '(6 + -1x)' equal to zero and attempt to solve: Simplifying 6 + -1x = 0 Solving 6 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + -1x = 0 + -6 Combine like terms: 6 + -6 = 0 0 + -1x = 0 + -6 -1x = 0 + -6 Combine like terms: 0 + -6 = -6 -1x = -6 Divide each side by '-1'. x = 6 Simplifying x = 6

Solution

x = {-3, 6}

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