4x^2-9=9x

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Solution for 4x^2-9=9x equation:


Simplifying
4x2 + -9 = 9x

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

Solving
-9 + 4x2 = 9x

Solving for variable 'x'.

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

Combine like terms: 9x + -9x = 0
-9 + -9x + 4x2 = 0

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

Subproblem 1

Set the factor '(-3 + -4x)' equal to zero and attempt to solve: Simplifying -3 + -4x = 0 Solving -3 + -4x = 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 + -4x = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -4x = 0 + 3 -4x = 0 + 3 Combine like terms: 0 + 3 = 3 -4x = 3 Divide each side by '-4'. x = -0.75 Simplifying x = -0.75

Subproblem 2

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

Solution

x = {-0.75, 3}

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