3x-15=x(x)-x-20

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Solution for 3x-15=x(x)-x-20 equation:


Simplifying
3x + -15 = x(x) + -1x + -20

Reorder the terms:
-15 + 3x = x(x) + -1x + -20

Multiply x * x
-15 + 3x = x2 + -1x + -20

Reorder the terms:
-15 + 3x = -20 + -1x + x2

Solving
-15 + 3x = -20 + -1x + x2

Solving for variable 'x'.

Reorder the terms:
-15 + 20 + 3x + x + -1x2 = -20 + -1x + x2 + 20 + x + -1x2

Combine like terms: -15 + 20 = 5
5 + 3x + x + -1x2 = -20 + -1x + x2 + 20 + x + -1x2

Combine like terms: 3x + x = 4x
5 + 4x + -1x2 = -20 + -1x + x2 + 20 + x + -1x2

Reorder the terms:
5 + 4x + -1x2 = -20 + 20 + -1x + x + x2 + -1x2

Combine like terms: -20 + 20 = 0
5 + 4x + -1x2 = 0 + -1x + x + x2 + -1x2
5 + 4x + -1x2 = -1x + x + x2 + -1x2

Combine like terms: -1x + x = 0
5 + 4x + -1x2 = 0 + x2 + -1x2
5 + 4x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
5 + 4x + -1x2 = 0

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

Subproblem 1

Set the factor '(5 + -1x)' equal to zero and attempt to solve: Simplifying 5 + -1x = 0 Solving 5 + -1x = 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 + -1x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -1x = 0 + -5 -1x = 0 + -5 Combine like terms: 0 + -5 = -5 -1x = -5 Divide each side by '-1'. x = 5 Simplifying x = 5

Subproblem 2

Set the factor '(1 + x)' equal to zero and attempt to solve: Simplifying 1 + x = 0 Solving 1 + x = 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 + x = 0 + -1 Combine like terms: 1 + -1 = 0 0 + x = 0 + -1 x = 0 + -1 Combine like terms: 0 + -1 = -1 x = -1 Simplifying x = -1

Solution

x = {5, -1}

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