x^2+8x-300=2980

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Solution for x^2+8x-300=2980 equation:


Simplifying
x2 + 8x + -300 = 2980

Reorder the terms:
-300 + 8x + x2 = 2980

Solving
-300 + 8x + x2 = 2980

Solving for variable 'x'.

Reorder the terms:
-300 + -2980 + 8x + x2 = 2980 + -2980

Combine like terms: -300 + -2980 = -3280
-3280 + 8x + x2 = 2980 + -2980

Combine like terms: 2980 + -2980 = 0
-3280 + 8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '3280' to each side of the equation.
-3280 + 8x + 3280 + x2 = 0 + 3280

Reorder the terms:
-3280 + 3280 + 8x + x2 = 0 + 3280

Combine like terms: -3280 + 3280 = 0
0 + 8x + x2 = 0 + 3280
8x + x2 = 0 + 3280

Combine like terms: 0 + 3280 = 3280
8x + x2 = 3280

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 = 3280 + 16

Reorder the terms:
16 + 8x + x2 = 3280 + 16

Combine like terms: 3280 + 16 = 3296
16 + 8x + x2 = 3296

Factor a perfect square on the left side:
(x + 4)(x + 4) = 3296

Calculate the square root of the right side: 57.410800378

Break this problem into two subproblems by setting 
(x + 4) equal to 57.410800378 and -57.410800378.

Subproblem 1

x + 4 = 57.410800378 Simplifying x + 4 = 57.410800378 Reorder the terms: 4 + x = 57.410800378 Solving 4 + x = 57.410800378 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 = 57.410800378 + -4 Combine like terms: 4 + -4 = 0 0 + x = 57.410800378 + -4 x = 57.410800378 + -4 Combine like terms: 57.410800378 + -4 = 53.410800378 x = 53.410800378 Simplifying x = 53.410800378

Subproblem 2

x + 4 = -57.410800378 Simplifying x + 4 = -57.410800378 Reorder the terms: 4 + x = -57.410800378 Solving 4 + x = -57.410800378 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 = -57.410800378 + -4 Combine like terms: 4 + -4 = 0 0 + x = -57.410800378 + -4 x = -57.410800378 + -4 Combine like terms: -57.410800378 + -4 = -61.410800378 x = -61.410800378 Simplifying x = -61.410800378

Solution

The solution to the problem is based on the solutions from the subproblems. x = {53.410800378, -61.410800378}

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