x^2+8x=154

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Solution for x^2+8x=154 equation:


Simplifying
x2 + 8x = 154

Reorder the terms:
8x + x2 = 154

Solving
8x + x2 = 154

Solving for variable 'x'.

Reorder the terms:
-154 + 8x + x2 = 154 + -154

Combine like terms: 154 + -154 = 0
-154 + 8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '154' to each side of the equation.
-154 + 8x + 154 + x2 = 0 + 154

Reorder the terms:
-154 + 154 + 8x + x2 = 0 + 154

Combine like terms: -154 + 154 = 0
0 + 8x + x2 = 0 + 154
8x + x2 = 0 + 154

Combine like terms: 0 + 154 = 154
8x + x2 = 154

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 = 154 + 16

Reorder the terms:
16 + 8x + x2 = 154 + 16

Combine like terms: 154 + 16 = 170
16 + 8x + x2 = 170

Factor a perfect square on the left side:
(x + 4)(x + 4) = 170

Calculate the square root of the right side: 13.03840481

Break this problem into two subproblems by setting 
(x + 4) equal to 13.03840481 and -13.03840481.

Subproblem 1

x + 4 = 13.03840481 Simplifying x + 4 = 13.03840481 Reorder the terms: 4 + x = 13.03840481 Solving 4 + x = 13.03840481 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 = 13.03840481 + -4 Combine like terms: 4 + -4 = 0 0 + x = 13.03840481 + -4 x = 13.03840481 + -4 Combine like terms: 13.03840481 + -4 = 9.03840481 x = 9.03840481 Simplifying x = 9.03840481

Subproblem 2

x + 4 = -13.03840481 Simplifying x + 4 = -13.03840481 Reorder the terms: 4 + x = -13.03840481 Solving 4 + x = -13.03840481 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 = -13.03840481 + -4 Combine like terms: 4 + -4 = 0 0 + x = -13.03840481 + -4 x = -13.03840481 + -4 Combine like terms: -13.03840481 + -4 = -17.03840481 x = -17.03840481 Simplifying x = -17.03840481

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.03840481, -17.03840481}

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