x^2+5x-105=0

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Solution for x^2+5x-105=0 equation:


Simplifying
x2 + 5x + -105 = 0

Reorder the terms:
-105 + 5x + x2 = 0

Solving
-105 + 5x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '105' to each side of the equation.
-105 + 5x + 105 + x2 = 0 + 105

Reorder the terms:
-105 + 105 + 5x + x2 = 0 + 105

Combine like terms: -105 + 105 = 0
0 + 5x + x2 = 0 + 105
5x + x2 = 0 + 105

Combine like terms: 0 + 105 = 105
5x + x2 = 105

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 105 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 105 + 6.25

Combine like terms: 105 + 6.25 = 111.25
6.25 + 5x + x2 = 111.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 111.25

Calculate the square root of the right side: 10.547511555

Break this problem into two subproblems by setting 
(x + 2.5) equal to 10.547511555 and -10.547511555.

Subproblem 1

x + 2.5 = 10.547511555 Simplifying x + 2.5 = 10.547511555 Reorder the terms: 2.5 + x = 10.547511555 Solving 2.5 + x = 10.547511555 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 10.547511555 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 10.547511555 + -2.5 x = 10.547511555 + -2.5 Combine like terms: 10.547511555 + -2.5 = 8.047511555 x = 8.047511555 Simplifying x = 8.047511555

Subproblem 2

x + 2.5 = -10.547511555 Simplifying x + 2.5 = -10.547511555 Reorder the terms: 2.5 + x = -10.547511555 Solving 2.5 + x = -10.547511555 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -10.547511555 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -10.547511555 + -2.5 x = -10.547511555 + -2.5 Combine like terms: -10.547511555 + -2.5 = -13.047511555 x = -13.047511555 Simplifying x = -13.047511555

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.047511555, -13.047511555}

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