x^2+8x+16=2.67

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Solution for x^2+8x+16=2.67 equation:


Simplifying
x2 + 8x + 16 = 2.67

Reorder the terms:
16 + 8x + x2 = 2.67

Solving
16 + 8x + x2 = 2.67

Solving for variable 'x'.

Reorder the terms:
16 + -2.67 + 8x + x2 = 2.67 + -2.67

Combine like terms: 16 + -2.67 = 13.33
13.33 + 8x + x2 = 2.67 + -2.67

Combine like terms: 2.67 + -2.67 = 0.00
13.33 + 8x + x2 = 0.00

Begin completing the square.

Move the constant term to the right:

Add '-13.33' to each side of the equation.
13.33 + 8x + -13.33 + x2 = 0.00 + -13.33

Reorder the terms:
13.33 + -13.33 + 8x + x2 = 0.00 + -13.33

Combine like terms: 13.33 + -13.33 = 0.00
0.00 + 8x + x2 = 0.00 + -13.33
8x + x2 = 0.00 + -13.33

Combine like terms: 0.00 + -13.33 = -13.33
8x + x2 = -13.33

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 = -13.33 + 16

Reorder the terms:
16 + 8x + x2 = -13.33 + 16

Combine like terms: -13.33 + 16 = 2.67
16 + 8x + x2 = 2.67

Factor a perfect square on the left side:
(x + 4)(x + 4) = 2.67

Calculate the square root of the right side: 1.634013464

Break this problem into two subproblems by setting 
(x + 4) equal to 1.634013464 and -1.634013464.

Subproblem 1

x + 4 = 1.634013464 Simplifying x + 4 = 1.634013464 Reorder the terms: 4 + x = 1.634013464 Solving 4 + x = 1.634013464 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 = 1.634013464 + -4 Combine like terms: 4 + -4 = 0 0 + x = 1.634013464 + -4 x = 1.634013464 + -4 Combine like terms: 1.634013464 + -4 = -2.365986536 x = -2.365986536 Simplifying x = -2.365986536

Subproblem 2

x + 4 = -1.634013464 Simplifying x + 4 = -1.634013464 Reorder the terms: 4 + x = -1.634013464 Solving 4 + x = -1.634013464 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 = -1.634013464 + -4 Combine like terms: 4 + -4 = 0 0 + x = -1.634013464 + -4 x = -1.634013464 + -4 Combine like terms: -1.634013464 + -4 = -5.634013464 x = -5.634013464 Simplifying x = -5.634013464

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-2.365986536, -5.634013464}

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