(X-4)(X-12)=80

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Solution for (X-4)(X-12)=80 equation:


Simplifying
(X + -4)(X + -12) = 80

Reorder the terms:
(-4 + X)(X + -12) = 80

Reorder the terms:
(-4 + X)(-12 + X) = 80

Multiply (-4 + X) * (-12 + X)
(-4(-12 + X) + X(-12 + X)) = 80
((-12 * -4 + X * -4) + X(-12 + X)) = 80
((48 + -4X) + X(-12 + X)) = 80
(48 + -4X + (-12 * X + X * X)) = 80
(48 + -4X + (-12X + X2)) = 80

Combine like terms: -4X + -12X = -16X
(48 + -16X + X2) = 80

Solving
48 + -16X + X2 = 80

Solving for variable 'X'.

Reorder the terms:
48 + -80 + -16X + X2 = 80 + -80

Combine like terms: 48 + -80 = -32
-32 + -16X + X2 = 80 + -80

Combine like terms: 80 + -80 = 0
-32 + -16X + X2 = 0

Begin completing the square.

Move the constant term to the right:

Add '32' to each side of the equation.
-32 + -16X + 32 + X2 = 0 + 32

Reorder the terms:
-32 + 32 + -16X + X2 = 0 + 32

Combine like terms: -32 + 32 = 0
0 + -16X + X2 = 0 + 32
-16X + X2 = 0 + 32

Combine like terms: 0 + 32 = 32
-16X + X2 = 32

The X term is -16X.  Take half its coefficient (-8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
-16X + 64 + X2 = 32 + 64

Reorder the terms:
64 + -16X + X2 = 32 + 64

Combine like terms: 32 + 64 = 96
64 + -16X + X2 = 96

Factor a perfect square on the left side:
(X + -8)(X + -8) = 96

Calculate the square root of the right side: 9.797958971

Break this problem into two subproblems by setting 
(X + -8) equal to 9.797958971 and -9.797958971.

Subproblem 1

X + -8 = 9.797958971 Simplifying X + -8 = 9.797958971 Reorder the terms: -8 + X = 9.797958971 Solving -8 + X = 9.797958971 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + X = 9.797958971 + 8 Combine like terms: -8 + 8 = 0 0 + X = 9.797958971 + 8 X = 9.797958971 + 8 Combine like terms: 9.797958971 + 8 = 17.797958971 X = 17.797958971 Simplifying X = 17.797958971

Subproblem 2

X + -8 = -9.797958971 Simplifying X + -8 = -9.797958971 Reorder the terms: -8 + X = -9.797958971 Solving -8 + X = -9.797958971 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + X = -9.797958971 + 8 Combine like terms: -8 + 8 = 0 0 + X = -9.797958971 + 8 X = -9.797958971 + 8 Combine like terms: -9.797958971 + 8 = -1.797958971 X = -1.797958971 Simplifying X = -1.797958971

Solution

The solution to the problem is based on the solutions from the subproblems. X = {17.797958971, -1.797958971}

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