(x-8)(x-2)-7=0

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Solution for (x-8)(x-2)-7=0 equation: 


Simplifying
(x + -8)(x + -2) + -7 = 0

Reorder the terms:
(-8 + x)(x + -2) + -7 = 0

Reorder the terms:
(-8 + x)(-2 + x) + -7 = 0

Multiply (-8 + x) * (-2 + x)
(-8(-2 + x) + x(-2 + x)) + -7 = 0
((-2 * -8 + x * -8) + x(-2 + x)) + -7 = 0
((16 + -8x) + x(-2 + x)) + -7 = 0
(16 + -8x + (-2 * x + x * x)) + -7 = 0
(16 + -8x + (-2x + x2)) + -7 = 0

Combine like terms: -8x + -2x = -10x
(16 + -10x + x2) + -7 = 0

Reorder the terms:
16 + -7 + -10x + x2 = 0

Combine like terms: 16 + -7 = 9
9 + -10x + x2 = 0

Solving
9 + -10x + x2 = 0

Solving for variable 'x'.

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


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 '(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
Solution
x = {1, 9}

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