x^2+8x=624

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Solution for x^2+8x=624 equation:


Simplifying
x2 + 8x = 624

Reorder the terms:
8x + x2 = 624

Solving
8x + x2 = 624

Solving for variable 'x'.

Reorder the terms:
-624 + 8x + x2 = 624 + -624

Combine like terms: 624 + -624 = 0
-624 + 8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '624' to each side of the equation.
-624 + 8x + 624 + x2 = 0 + 624

Reorder the terms:
-624 + 624 + 8x + x2 = 0 + 624

Combine like terms: -624 + 624 = 0
0 + 8x + x2 = 0 + 624
8x + x2 = 0 + 624

Combine like terms: 0 + 624 = 624
8x + x2 = 624

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 = 624 + 16

Reorder the terms:
16 + 8x + x2 = 624 + 16

Combine like terms: 624 + 16 = 640
16 + 8x + x2 = 640

Factor a perfect square on the left side:
(x + 4)(x + 4) = 640

Calculate the square root of the right side: 25.298221281

Break this problem into two subproblems by setting 
(x + 4) equal to 25.298221281 and -25.298221281.

Subproblem 1

x + 4 = 25.298221281 Simplifying x + 4 = 25.298221281 Reorder the terms: 4 + x = 25.298221281 Solving 4 + x = 25.298221281 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 = 25.298221281 + -4 Combine like terms: 4 + -4 = 0 0 + x = 25.298221281 + -4 x = 25.298221281 + -4 Combine like terms: 25.298221281 + -4 = 21.298221281 x = 21.298221281 Simplifying x = 21.298221281

Subproblem 2

x + 4 = -25.298221281 Simplifying x + 4 = -25.298221281 Reorder the terms: 4 + x = -25.298221281 Solving 4 + x = -25.298221281 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 = -25.298221281 + -4 Combine like terms: 4 + -4 = 0 0 + x = -25.298221281 + -4 x = -25.298221281 + -4 Combine like terms: -25.298221281 + -4 = -29.298221281 x = -29.298221281 Simplifying x = -29.298221281

Solution

The solution to the problem is based on the solutions from the subproblems. x = {21.298221281, -29.298221281}

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