6x^2-15=9x

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Solution for 6x^2-15=9x equation:


Simplifying
6x2 + -15 = 9x

Reorder the terms:
-15 + 6x2 = 9x

Solving
-15 + 6x2 = 9x

Solving for variable 'x'.

Reorder the terms:
-15 + -9x + 6x2 = 9x + -9x

Combine like terms: 9x + -9x = 0
-15 + -9x + 6x2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(-5 + -3x + 2x2) = 0

Factor a trinomial.
3((-1 + -1x)(5 + -2x)) = 0

Ignore the factor 3.

Subproblem 1

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

Subproblem 2

Set the factor '(5 + -2x)' equal to zero and attempt to solve: Simplifying 5 + -2x = 0 Solving 5 + -2x = 0 Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -2x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -2x = 0 + -5 -2x = 0 + -5 Combine like terms: 0 + -5 = -5 -2x = -5 Divide each side by '-2'. x = 2.5 Simplifying x = 2.5

Solution

x = {-1, 2.5}

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