x^2+8x-300=2400

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Solution for x^2+8x-300=2400 equation:


Simplifying
x2 + 8x + -300 = 2400

Reorder the terms:
-300 + 8x + x2 = 2400

Solving
-300 + 8x + x2 = 2400

Solving for variable 'x'.

Reorder the terms:
-300 + -2400 + 8x + x2 = 2400 + -2400

Combine like terms: -300 + -2400 = -2700
-2700 + 8x + x2 = 2400 + -2400

Combine like terms: 2400 + -2400 = 0
-2700 + 8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '2700' to each side of the equation.
-2700 + 8x + 2700 + x2 = 0 + 2700

Reorder the terms:
-2700 + 2700 + 8x + x2 = 0 + 2700

Combine like terms: -2700 + 2700 = 0
0 + 8x + x2 = 0 + 2700
8x + x2 = 0 + 2700

Combine like terms: 0 + 2700 = 2700
8x + x2 = 2700

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 = 2700 + 16

Reorder the terms:
16 + 8x + x2 = 2700 + 16

Combine like terms: 2700 + 16 = 2716
16 + 8x + x2 = 2716

Factor a perfect square on the left side:
(x + 4)(x + 4) = 2716

Calculate the square root of the right side: 52.115256883

Break this problem into two subproblems by setting 
(x + 4) equal to 52.115256883 and -52.115256883.

Subproblem 1

x + 4 = 52.115256883 Simplifying x + 4 = 52.115256883 Reorder the terms: 4 + x = 52.115256883 Solving 4 + x = 52.115256883 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 = 52.115256883 + -4 Combine like terms: 4 + -4 = 0 0 + x = 52.115256883 + -4 x = 52.115256883 + -4 Combine like terms: 52.115256883 + -4 = 48.115256883 x = 48.115256883 Simplifying x = 48.115256883

Subproblem 2

x + 4 = -52.115256883 Simplifying x + 4 = -52.115256883 Reorder the terms: 4 + x = -52.115256883 Solving 4 + x = -52.115256883 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 = -52.115256883 + -4 Combine like terms: 4 + -4 = 0 0 + x = -52.115256883 + -4 x = -52.115256883 + -4 Combine like terms: -52.115256883 + -4 = -56.115256883 x = -56.115256883 Simplifying x = -56.115256883

Solution

The solution to the problem is based on the solutions from the subproblems. x = {48.115256883, -56.115256883}

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