x^2+8x+16=1.77

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Solution for x^2+8x+16=1.77 equation:


Simplifying
x2 + 8x + 16 = 1.77

Reorder the terms:
16 + 8x + x2 = 1.77

Solving
16 + 8x + x2 = 1.77

Solving for variable 'x'.

Reorder the terms:
16 + -1.77 + 8x + x2 = 1.77 + -1.77

Combine like terms: 16 + -1.77 = 14.23
14.23 + 8x + x2 = 1.77 + -1.77

Combine like terms: 1.77 + -1.77 = 0.00
14.23 + 8x + x2 = 0.00

Begin completing the square.

Move the constant term to the right:

Add '-14.23' to each side of the equation.
14.23 + 8x + -14.23 + x2 = 0.00 + -14.23

Reorder the terms:
14.23 + -14.23 + 8x + x2 = 0.00 + -14.23

Combine like terms: 14.23 + -14.23 = 0.00
0.00 + 8x + x2 = 0.00 + -14.23
8x + x2 = 0.00 + -14.23

Combine like terms: 0.00 + -14.23 = -14.23
8x + x2 = -14.23

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 = -14.23 + 16

Reorder the terms:
16 + 8x + x2 = -14.23 + 16

Combine like terms: -14.23 + 16 = 1.77
16 + 8x + x2 = 1.77

Factor a perfect square on the left side:
(x + 4)(x + 4) = 1.77

Calculate the square root of the right side: 1.33041347

Break this problem into two subproblems by setting 
(x + 4) equal to 1.33041347 and -1.33041347.

Subproblem 1

x + 4 = 1.33041347 Simplifying x + 4 = 1.33041347 Reorder the terms: 4 + x = 1.33041347 Solving 4 + x = 1.33041347 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 = 1.33041347 + -4 Combine like terms: 4 + -4 = 0 0 + x = 1.33041347 + -4 x = 1.33041347 + -4 Combine like terms: 1.33041347 + -4 = -2.66958653 x = -2.66958653 Simplifying x = -2.66958653

Subproblem 2

x + 4 = -1.33041347 Simplifying x + 4 = -1.33041347 Reorder the terms: 4 + x = -1.33041347 Solving 4 + x = -1.33041347 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 = -1.33041347 + -4 Combine like terms: 4 + -4 = 0 0 + x = -1.33041347 + -4 x = -1.33041347 + -4 Combine like terms: -1.33041347 + -4 = -5.33041347 x = -5.33041347 Simplifying x = -5.33041347

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-2.66958653, -5.33041347}

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