x^2+5x=75

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Solution for x^2+5x=75 equation:


Simplifying
x2 + 5x = 75

Reorder the terms:
5x + x2 = 75

Solving
5x + x2 = 75

Solving for variable 'x'.

Reorder the terms:
-75 + 5x + x2 = 75 + -75

Combine like terms: 75 + -75 = 0
-75 + 5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '75' to each side of the equation.
-75 + 5x + 75 + x2 = 0 + 75

Reorder the terms:
-75 + 75 + 5x + x2 = 0 + 75

Combine like terms: -75 + 75 = 0
0 + 5x + x2 = 0 + 75
5x + x2 = 0 + 75

Combine like terms: 0 + 75 = 75
5x + x2 = 75

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 = 75 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 75 + 6.25

Combine like terms: 75 + 6.25 = 81.25
6.25 + 5x + x2 = 81.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 81.25

Calculate the square root of the right side: 9.013878189

Break this problem into two subproblems by setting 
(x + 2.5) equal to 9.013878189 and -9.013878189.

Subproblem 1

x + 2.5 = 9.013878189 Simplifying x + 2.5 = 9.013878189 Reorder the terms: 2.5 + x = 9.013878189 Solving 2.5 + x = 9.013878189 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 = 9.013878189 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 9.013878189 + -2.5 x = 9.013878189 + -2.5 Combine like terms: 9.013878189 + -2.5 = 6.513878189 x = 6.513878189 Simplifying x = 6.513878189

Subproblem 2

x + 2.5 = -9.013878189 Simplifying x + 2.5 = -9.013878189 Reorder the terms: 2.5 + x = -9.013878189 Solving 2.5 + x = -9.013878189 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 = -9.013878189 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -9.013878189 + -2.5 x = -9.013878189 + -2.5 Combine like terms: -9.013878189 + -2.5 = -11.513878189 x = -11.513878189 Simplifying x = -11.513878189

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.513878189, -11.513878189}

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