x(x-7)+9(x-7)=0

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Solution for x(x-7)+9(x-7)=0 equation: 


Simplifying
x(x + -7) + 9(x + -7) = 0

Reorder the terms:
x(-7 + x) + 9(x + -7) = 0
(-7 * x + x * x) + 9(x + -7) = 0
(-7x + x2) + 9(x + -7) = 0

Reorder the terms:
-7x + x2 + 9(-7 + x) = 0
-7x + x2 + (-7 * 9 + x * 9) = 0
-7x + x2 + (-63 + 9x) = 0

Reorder the terms:
-63 + -7x + 9x + x2 = 0

Combine like terms: -7x + 9x = 2x
-63 + 2x + x2 = 0

Solving
-63 + 2x + x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-9 + -1x)(7 + -1x) = 0


Subproblem 1
Set the factor '(-9 + -1x)' equal to zero and attempt to solve:

Simplifying
-9 + -1x = 0

Solving
-9 + -1x = 0

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

Add '9' to each side of the equation.
-9 + 9 + -1x = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -1x = 0 + 9
-1x = 0 + 9

Combine like terms: 0 + 9 = 9
-1x = 9

Divide each side by '-1'.
x = -9

Simplifying
x = -9

Subproblem 2
Set the factor '(7 + -1x)' equal to zero and attempt to solve:

Simplifying
7 + -1x = 0

Solving
7 + -1x = 0

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

Add '-7' to each side of the equation.
7 + -7 + -1x = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -1x = 0 + -7
-1x = 0 + -7

Combine like terms: 0 + -7 = -7
-1x = -7

Divide each side by '-1'.
x = 7

Simplifying
x = 7
Solution
x = {-9, 7}

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