80=(x+8)(x+2)

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Solution for 80=(x+8)(x+2) equation:


Simplifying
80 = (x + 8)(x + 2)

Reorder the terms:
80 = (8 + x)(x + 2)

Reorder the terms:
80 = (8 + x)(2 + x)

Multiply (8 + x) * (2 + x)
80 = (8(2 + x) + x(2 + x))
80 = ((2 * 8 + x * 8) + x(2 + x))
80 = ((16 + 8x) + x(2 + x))
80 = (16 + 8x + (2 * x + x * x))
80 = (16 + 8x + (2x + x2))

Combine like terms: 8x + 2x = 10x
80 = (16 + 10x + x2)

Solving
80 = 16 + 10x + x2

Solving for variable 'x'.

Combine like terms: 80 + -16 = 64
64 + -10x + -1x2 = 16 + 10x + x2 + -16 + -10x + -1x2

Reorder the terms:
64 + -10x + -1x2 = 16 + -16 + 10x + -10x + x2 + -1x2

Combine like terms: 16 + -16 = 0
64 + -10x + -1x2 = 0 + 10x + -10x + x2 + -1x2
64 + -10x + -1x2 = 10x + -10x + x2 + -1x2

Combine like terms: 10x + -10x = 0
64 + -10x + -1x2 = 0 + x2 + -1x2
64 + -10x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
64 + -10x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-64 + 10x + x2 = 0

Move the constant term to the right:

Add '64' to each side of the equation.
-64 + 10x + 64 + x2 = 0 + 64

Reorder the terms:
-64 + 64 + 10x + x2 = 0 + 64

Combine like terms: -64 + 64 = 0
0 + 10x + x2 = 0 + 64
10x + x2 = 0 + 64

Combine like terms: 0 + 64 = 64
10x + x2 = 64

The x term is 10x.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10x + 25 + x2 = 64 + 25

Reorder the terms:
25 + 10x + x2 = 64 + 25

Combine like terms: 64 + 25 = 89
25 + 10x + x2 = 89

Factor a perfect square on the left side:
(x + 5)(x + 5) = 89

Calculate the square root of the right side: 9.433981132

Break this problem into two subproblems by setting 
(x + 5) equal to 9.433981132 and -9.433981132.

Subproblem 1

x + 5 = 9.433981132 Simplifying x + 5 = 9.433981132 Reorder the terms: 5 + x = 9.433981132 Solving 5 + x = 9.433981132 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 9.433981132 + -5 Combine like terms: 5 + -5 = 0 0 + x = 9.433981132 + -5 x = 9.433981132 + -5 Combine like terms: 9.433981132 + -5 = 4.433981132 x = 4.433981132 Simplifying x = 4.433981132

Subproblem 2

x + 5 = -9.433981132 Simplifying x + 5 = -9.433981132 Reorder the terms: 5 + x = -9.433981132 Solving 5 + x = -9.433981132 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = -9.433981132 + -5 Combine like terms: 5 + -5 = 0 0 + x = -9.433981132 + -5 x = -9.433981132 + -5 Combine like terms: -9.433981132 + -5 = -14.433981132 x = -14.433981132 Simplifying x = -14.433981132

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.433981132, -14.433981132}

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