x^2+8x-200=0

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Solution for x^2+8x-200=0 equation:


Simplifying
x2 + 8x + -200 = 0

Reorder the terms:
-200 + 8x + x2 = 0

Solving
-200 + 8x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '200' to each side of the equation.
-200 + 8x + 200 + x2 = 0 + 200

Reorder the terms:
-200 + 200 + 8x + x2 = 0 + 200

Combine like terms: -200 + 200 = 0
0 + 8x + x2 = 0 + 200
8x + x2 = 0 + 200

Combine like terms: 0 + 200 = 200
8x + x2 = 200

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 = 200 + 16

Reorder the terms:
16 + 8x + x2 = 200 + 16

Combine like terms: 200 + 16 = 216
16 + 8x + x2 = 216

Factor a perfect square on the left side:
(x + 4)(x + 4) = 216

Calculate the square root of the right side: 14.696938457

Break this problem into two subproblems by setting 
(x + 4) equal to 14.696938457 and -14.696938457.

Subproblem 1

x + 4 = 14.696938457 Simplifying x + 4 = 14.696938457 Reorder the terms: 4 + x = 14.696938457 Solving 4 + x = 14.696938457 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 = 14.696938457 + -4 Combine like terms: 4 + -4 = 0 0 + x = 14.696938457 + -4 x = 14.696938457 + -4 Combine like terms: 14.696938457 + -4 = 10.696938457 x = 10.696938457 Simplifying x = 10.696938457

Subproblem 2

x + 4 = -14.696938457 Simplifying x + 4 = -14.696938457 Reorder the terms: 4 + x = -14.696938457 Solving 4 + x = -14.696938457 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 = -14.696938457 + -4 Combine like terms: 4 + -4 = 0 0 + x = -14.696938457 + -4 x = -14.696938457 + -4 Combine like terms: -14.696938457 + -4 = -18.696938457 x = -18.696938457 Simplifying x = -18.696938457

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.696938457, -18.696938457}

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