x^2+8x-300=1300

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Solution for x^2+8x-300=1300 equation:


Simplifying
x2 + 8x + -300 = 1300

Reorder the terms:
-300 + 8x + x2 = 1300

Solving
-300 + 8x + x2 = 1300

Solving for variable 'x'.

Reorder the terms:
-300 + -1300 + 8x + x2 = 1300 + -1300

Combine like terms: -300 + -1300 = -1600
-1600 + 8x + x2 = 1300 + -1300

Combine like terms: 1300 + -1300 = 0
-1600 + 8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '1600' to each side of the equation.
-1600 + 8x + 1600 + x2 = 0 + 1600

Reorder the terms:
-1600 + 1600 + 8x + x2 = 0 + 1600

Combine like terms: -1600 + 1600 = 0
0 + 8x + x2 = 0 + 1600
8x + x2 = 0 + 1600

Combine like terms: 0 + 1600 = 1600
8x + x2 = 1600

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 = 1600 + 16

Reorder the terms:
16 + 8x + x2 = 1600 + 16

Combine like terms: 1600 + 16 = 1616
16 + 8x + x2 = 1616

Factor a perfect square on the left side:
(x + 4)(x + 4) = 1616

Calculate the square root of the right side: 40.199502484

Break this problem into two subproblems by setting 
(x + 4) equal to 40.199502484 and -40.199502484.

Subproblem 1

x + 4 = 40.199502484 Simplifying x + 4 = 40.199502484 Reorder the terms: 4 + x = 40.199502484 Solving 4 + x = 40.199502484 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 = 40.199502484 + -4 Combine like terms: 4 + -4 = 0 0 + x = 40.199502484 + -4 x = 40.199502484 + -4 Combine like terms: 40.199502484 + -4 = 36.199502484 x = 36.199502484 Simplifying x = 36.199502484

Subproblem 2

x + 4 = -40.199502484 Simplifying x + 4 = -40.199502484 Reorder the terms: 4 + x = -40.199502484 Solving 4 + x = -40.199502484 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 = -40.199502484 + -4 Combine like terms: 4 + -4 = 0 0 + x = -40.199502484 + -4 x = -40.199502484 + -4 Combine like terms: -40.199502484 + -4 = -44.199502484 x = -44.199502484 Simplifying x = -44.199502484

Solution

The solution to the problem is based on the solutions from the subproblems. x = {36.199502484, -44.199502484}

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