x(x-9)+3(x-1)=13

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Solution for x(x-9)+3(x-1)=13 equation: 


Simplifying
x(x + -9) + 3(x + -1) = 13

Reorder the terms:
x(-9 + x) + 3(x + -1) = 13
(-9 * x + x * x) + 3(x + -1) = 13
(-9x + x2) + 3(x + -1) = 13

Reorder the terms:
-9x + x2 + 3(-1 + x) = 13
-9x + x2 + (-1 * 3 + x * 3) = 13
-9x + x2 + (-3 + 3x) = 13

Reorder the terms:
-3 + -9x + 3x + x2 = 13

Combine like terms: -9x + 3x = -6x
-3 + -6x + x2 = 13

Solving
-3 + -6x + x2 = 13

Solving for variable 'x'.

Reorder the terms:
-3 + -13 + -6x + x2 = 13 + -13

Combine like terms: -3 + -13 = -16
-16 + -6x + x2 = 13 + -13

Combine like terms: 13 + -13 = 0
-16 + -6x + x2 = 0

Factor a trinomial.
(-2 + -1x)(8 + -1x) = 0


Subproblem 1
Set the factor '(-2 + -1x)' equal to zero and attempt to solve:

Simplifying
-2 + -1x = 0

Solving
-2 + -1x = 0

Move all terms containing x to the left, all other terms to the right.

Add '2' to each side of the equation.
-2 + 2 + -1x = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -1x = 0 + 2
-1x = 0 + 2

Combine like terms: 0 + 2 = 2
-1x = 2

Divide each side by '-1'.
x = -2

Simplifying
x = -2

Subproblem 2
Set the factor '(8 + -1x)' equal to zero and attempt to solve:

Simplifying
8 + -1x = 0

Solving
8 + -1x = 0

Move all terms containing x to the left, all other terms to the right.

Add '-8' to each side of the equation.
8 + -8 + -1x = 0 + -8

Combine like terms: 8 + -8 = 0
0 + -1x = 0 + -8
-1x = 0 + -8

Combine like terms: 0 + -8 = -8
-1x = -8

Divide each side by '-1'.
x = 8

Simplifying
x = 8
Solution
x = {-2, 8}

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