0=x^2+8x-144

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Solution for 0=x^2+8x-144 equation:


Simplifying
0 = x2 + 8x + -144

Reorder the terms:
0 = -144 + 8x + x2

Solving
0 = -144 + 8x + x2

Solving for variable 'x'.

Combine like terms: 0 + 144 = 144
144 + -8x + -1x2 = -144 + 8x + x2 + 144 + -8x + -1x2

Reorder the terms:
144 + -8x + -1x2 = -144 + 144 + 8x + -8x + x2 + -1x2

Combine like terms: -144 + 144 = 0
144 + -8x + -1x2 = 0 + 8x + -8x + x2 + -1x2
144 + -8x + -1x2 = 8x + -8x + x2 + -1x2

Combine like terms: 8x + -8x = 0
144 + -8x + -1x2 = 0 + x2 + -1x2
144 + -8x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
144 + -8x + -1x2 = 0

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

Divide each side by '-1'.
-144 + 8x + x2 = 0

Move the constant term to the right:

Add '144' to each side of the equation.
-144 + 8x + 144 + x2 = 0 + 144

Reorder the terms:
-144 + 144 + 8x + x2 = 0 + 144

Combine like terms: -144 + 144 = 0
0 + 8x + x2 = 0 + 144
8x + x2 = 0 + 144

Combine like terms: 0 + 144 = 144
8x + x2 = 144

The x term is 8x.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8x + 16 + x2 = 144 + 16

Reorder the terms:
16 + 8x + x2 = 144 + 16

Combine like terms: 144 + 16 = 160
16 + 8x + x2 = 160

Factor a perfect square on the left side:
(x + 4)(x + 4) = 160

Calculate the square root of the right side: 12.649110641

Break this problem into two subproblems by setting 
(x + 4) equal to 12.649110641 and -12.649110641.

Subproblem 1

x + 4 = 12.649110641 Simplifying x + 4 = 12.649110641 Reorder the terms: 4 + x = 12.649110641 Solving 4 + x = 12.649110641 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 12.649110641 + -4 Combine like terms: 4 + -4 = 0 0 + x = 12.649110641 + -4 x = 12.649110641 + -4 Combine like terms: 12.649110641 + -4 = 8.649110641 x = 8.649110641 Simplifying x = 8.649110641

Subproblem 2

x + 4 = -12.649110641 Simplifying x + 4 = -12.649110641 Reorder the terms: 4 + x = -12.649110641 Solving 4 + x = -12.649110641 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = -12.649110641 + -4 Combine like terms: 4 + -4 = 0 0 + x = -12.649110641 + -4 x = -12.649110641 + -4 Combine like terms: -12.649110641 + -4 = -16.649110641 x = -16.649110641 Simplifying x = -16.649110641

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.649110641, -16.649110641}

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