15x^2=13x+20

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Solution for 15x^2=13x+20 equation:


Simplifying
15x2 = 13x + 20

Reorder the terms:
15x2 = 20 + 13x

Solving
15x2 = 20 + 13x

Solving for variable 'x'.

Reorder the terms:
-20 + -13x + 15x2 = 20 + 13x + -20 + -13x

Reorder the terms:
-20 + -13x + 15x2 = 20 + -20 + 13x + -13x

Combine like terms: 20 + -20 = 0
-20 + -13x + 15x2 = 0 + 13x + -13x
-20 + -13x + 15x2 = 13x + -13x

Combine like terms: 13x + -13x = 0
-20 + -13x + 15x2 = 0

Factor a trinomial.
(-4 + -5x)(5 + -3x) = 0

Subproblem 1

Set the factor '(-4 + -5x)' equal to zero and attempt to solve: Simplifying -4 + -5x = 0 Solving -4 + -5x = 0 Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + -5x = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -5x = 0 + 4 -5x = 0 + 4 Combine like terms: 0 + 4 = 4 -5x = 4 Divide each side by '-5'. x = -0.8 Simplifying x = -0.8

Subproblem 2

Set the factor '(5 + -3x)' equal to zero and attempt to solve: Simplifying 5 + -3x = 0 Solving 5 + -3x = 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 + -3x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -3x = 0 + -5 -3x = 0 + -5 Combine like terms: 0 + -5 = -5 -3x = -5 Divide each side by '-3'. x = 1.666666667 Simplifying x = 1.666666667

Solution

x = {-0.8, 1.666666667}

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