x^2+8x+16=99

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Solution for x^2+8x+16=99 equation:


Simplifying
x2 + 8x + 16 = 99

Reorder the terms:
16 + 8x + x2 = 99

Solving
16 + 8x + x2 = 99

Solving for variable 'x'.

Reorder the terms:
16 + -99 + 8x + x2 = 99 + -99

Combine like terms: 16 + -99 = -83
-83 + 8x + x2 = 99 + -99

Combine like terms: 99 + -99 = 0
-83 + 8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '83' to each side of the equation.
-83 + 8x + 83 + x2 = 0 + 83

Reorder the terms:
-83 + 83 + 8x + x2 = 0 + 83

Combine like terms: -83 + 83 = 0
0 + 8x + x2 = 0 + 83
8x + x2 = 0 + 83

Combine like terms: 0 + 83 = 83
8x + x2 = 83

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 = 83 + 16

Reorder the terms:
16 + 8x + x2 = 83 + 16

Combine like terms: 83 + 16 = 99
16 + 8x + x2 = 99

Factor a perfect square on the left side:
(x + 4)(x + 4) = 99

Calculate the square root of the right side: 9.949874371

Break this problem into two subproblems by setting 
(x + 4) equal to 9.949874371 and -9.949874371.

Subproblem 1

x + 4 = 9.949874371 Simplifying x + 4 = 9.949874371 Reorder the terms: 4 + x = 9.949874371 Solving 4 + x = 9.949874371 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 = 9.949874371 + -4 Combine like terms: 4 + -4 = 0 0 + x = 9.949874371 + -4 x = 9.949874371 + -4 Combine like terms: 9.949874371 + -4 = 5.949874371 x = 5.949874371 Simplifying x = 5.949874371

Subproblem 2

x + 4 = -9.949874371 Simplifying x + 4 = -9.949874371 Reorder the terms: 4 + x = -9.949874371 Solving 4 + x = -9.949874371 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 = -9.949874371 + -4 Combine like terms: 4 + -4 = 0 0 + x = -9.949874371 + -4 x = -9.949874371 + -4 Combine like terms: -9.949874371 + -4 = -13.949874371 x = -13.949874371 Simplifying x = -13.949874371

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.949874371, -13.949874371}

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