0=-5x(x)+20x-15

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Solution for 0=-5x(x)+20x-15 equation:


Simplifying
0 = -5x(x) + 20x + -15

Multiply x * x
0 = -5x2 + 20x + -15

Reorder the terms:
0 = -15 + 20x + -5x2

Solving
0 = -15 + 20x + -5x2

Solving for variable 'x'.

Combine like terms: 0 + 15 = 15
15 + -20x + 5x2 = -15 + 20x + -5x2 + 15 + -20x + 5x2

Reorder the terms:
15 + -20x + 5x2 = -15 + 15 + 20x + -20x + -5x2 + 5x2

Combine like terms: -15 + 15 = 0
15 + -20x + 5x2 = 0 + 20x + -20x + -5x2 + 5x2
15 + -20x + 5x2 = 20x + -20x + -5x2 + 5x2

Combine like terms: 20x + -20x = 0
15 + -20x + 5x2 = 0 + -5x2 + 5x2
15 + -20x + 5x2 = -5x2 + 5x2

Combine like terms: -5x2 + 5x2 = 0
15 + -20x + 5x2 = 0

Factor out the Greatest Common Factor (GCF), '5'.
5(3 + -4x + x2) = 0

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

Ignore the factor 5.

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 '(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 = {1, 3}

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