x^2+8x=29

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Solution for x^2+8x=29 equation:


Simplifying
x2 + 8x = 29

Reorder the terms:
8x + x2 = 29

Solving
8x + x2 = 29

Solving for variable 'x'.

Reorder the terms:
-29 + 8x + x2 = 29 + -29

Combine like terms: 29 + -29 = 0
-29 + 8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '29' to each side of the equation.
-29 + 8x + 29 + x2 = 0 + 29

Reorder the terms:
-29 + 29 + 8x + x2 = 0 + 29

Combine like terms: -29 + 29 = 0
0 + 8x + x2 = 0 + 29
8x + x2 = 0 + 29

Combine like terms: 0 + 29 = 29
8x + x2 = 29

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 = 29 + 16

Reorder the terms:
16 + 8x + x2 = 29 + 16

Combine like terms: 29 + 16 = 45
16 + 8x + x2 = 45

Factor a perfect square on the left side:
(x + 4)(x + 4) = 45

Calculate the square root of the right side: 6.708203933

Break this problem into two subproblems by setting 
(x + 4) equal to 6.708203933 and -6.708203933.

Subproblem 1

x + 4 = 6.708203933 Simplifying x + 4 = 6.708203933 Reorder the terms: 4 + x = 6.708203933 Solving 4 + x = 6.708203933 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 = 6.708203933 + -4 Combine like terms: 4 + -4 = 0 0 + x = 6.708203933 + -4 x = 6.708203933 + -4 Combine like terms: 6.708203933 + -4 = 2.708203933 x = 2.708203933 Simplifying x = 2.708203933

Subproblem 2

x + 4 = -6.708203933 Simplifying x + 4 = -6.708203933 Reorder the terms: 4 + x = -6.708203933 Solving 4 + x = -6.708203933 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 = -6.708203933 + -4 Combine like terms: 4 + -4 = 0 0 + x = -6.708203933 + -4 x = -6.708203933 + -4 Combine like terms: -6.708203933 + -4 = -10.708203933 x = -10.708203933 Simplifying x = -10.708203933

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.708203933, -10.708203933}

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