-5x^2+90x=225

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Solution for -5x^2+90x=225 equation:


Simplifying
-5x2 + 90x = 225

Reorder the terms:
90x + -5x2 = 225

Solving
90x + -5x2 = 225

Solving for variable 'x'.

Reorder the terms:
-225 + 90x + -5x2 = 225 + -225

Combine like terms: 225 + -225 = 0
-225 + 90x + -5x2 = 0

Factor out the Greatest Common Factor (GCF), '5'.
5(-45 + 18x + -1x2) = 0

Factor a trinomial.
5((-15 + x)(3 + -1x)) = 0

Ignore the factor 5.

Subproblem 1

Set the factor '(-15 + x)' equal to zero and attempt to solve: Simplifying -15 + x = 0 Solving -15 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + x = 0 + 15 Combine like terms: -15 + 15 = 0 0 + x = 0 + 15 x = 0 + 15 Combine like terms: 0 + 15 = 15 x = 15 Simplifying x = 15

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 = {15, 3}

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