x^2+8x-330=0

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Solution for x^2+8x-330=0 equation:


Simplifying
x2 + 8x + -330 = 0

Reorder the terms:
-330 + 8x + x2 = 0

Solving
-330 + 8x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '330' to each side of the equation.
-330 + 8x + 330 + x2 = 0 + 330

Reorder the terms:
-330 + 330 + 8x + x2 = 0 + 330

Combine like terms: -330 + 330 = 0
0 + 8x + x2 = 0 + 330
8x + x2 = 0 + 330

Combine like terms: 0 + 330 = 330
8x + x2 = 330

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 = 330 + 16

Reorder the terms:
16 + 8x + x2 = 330 + 16

Combine like terms: 330 + 16 = 346
16 + 8x + x2 = 346

Factor a perfect square on the left side:
(x + 4)(x + 4) = 346

Calculate the square root of the right side: 18.601075238

Break this problem into two subproblems by setting 
(x + 4) equal to 18.601075238 and -18.601075238.

Subproblem 1

x + 4 = 18.601075238 Simplifying x + 4 = 18.601075238 Reorder the terms: 4 + x = 18.601075238 Solving 4 + x = 18.601075238 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 = 18.601075238 + -4 Combine like terms: 4 + -4 = 0 0 + x = 18.601075238 + -4 x = 18.601075238 + -4 Combine like terms: 18.601075238 + -4 = 14.601075238 x = 14.601075238 Simplifying x = 14.601075238

Subproblem 2

x + 4 = -18.601075238 Simplifying x + 4 = -18.601075238 Reorder the terms: 4 + x = -18.601075238 Solving 4 + x = -18.601075238 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 = -18.601075238 + -4 Combine like terms: 4 + -4 = 0 0 + x = -18.601075238 + -4 x = -18.601075238 + -4 Combine like terms: -18.601075238 + -4 = -22.601075238 x = -22.601075238 Simplifying x = -22.601075238

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.601075238, -22.601075238}

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