x^2+8x+16=1.7

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Solution for x^2+8x+16=1.7 equation:


Simplifying
x2 + 8x + 16 = 1.7

Reorder the terms:
16 + 8x + x2 = 1.7

Solving
16 + 8x + x2 = 1.7

Solving for variable 'x'.

Reorder the terms:
16 + -1.7 + 8x + x2 = 1.7 + -1.7

Combine like terms: 16 + -1.7 = 14.3
14.3 + 8x + x2 = 1.7 + -1.7

Combine like terms: 1.7 + -1.7 = 0.0
14.3 + 8x + x2 = 0.0

Begin completing the square.

Move the constant term to the right:

Add '-14.3' to each side of the equation.
14.3 + 8x + -14.3 + x2 = 0.0 + -14.3

Reorder the terms:
14.3 + -14.3 + 8x + x2 = 0.0 + -14.3

Combine like terms: 14.3 + -14.3 = 0.0
0.0 + 8x + x2 = 0.0 + -14.3
8x + x2 = 0.0 + -14.3

Combine like terms: 0.0 + -14.3 = -14.3
8x + x2 = -14.3

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 = -14.3 + 16

Reorder the terms:
16 + 8x + x2 = -14.3 + 16

Combine like terms: -14.3 + 16 = 1.7
16 + 8x + x2 = 1.7

Factor a perfect square on the left side:
(x + 4)(x + 4) = 1.7

Calculate the square root of the right side: 1.303840481

Break this problem into two subproblems by setting 
(x + 4) equal to 1.303840481 and -1.303840481.

Subproblem 1

x + 4 = 1.303840481 Simplifying x + 4 = 1.303840481 Reorder the terms: 4 + x = 1.303840481 Solving 4 + x = 1.303840481 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 = 1.303840481 + -4 Combine like terms: 4 + -4 = 0 0 + x = 1.303840481 + -4 x = 1.303840481 + -4 Combine like terms: 1.303840481 + -4 = -2.696159519 x = -2.696159519 Simplifying x = -2.696159519

Subproblem 2

x + 4 = -1.303840481 Simplifying x + 4 = -1.303840481 Reorder the terms: 4 + x = -1.303840481 Solving 4 + x = -1.303840481 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 = -1.303840481 + -4 Combine like terms: 4 + -4 = 0 0 + x = -1.303840481 + -4 x = -1.303840481 + -4 Combine like terms: -1.303840481 + -4 = -5.303840481 x = -5.303840481 Simplifying x = -5.303840481

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-2.696159519, -5.303840481}

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