x^2+4x=75

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Solution for x^2+4x=75 equation:


Simplifying
x2 + 4x = 75

Reorder the terms:
4x + x2 = 75

Solving
4x + x2 = 75

Solving for variable 'x'.

Reorder the terms:
-75 + 4x + x2 = 75 + -75

Combine like terms: 75 + -75 = 0
-75 + 4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '75' to each side of the equation.
-75 + 4x + 75 + x2 = 0 + 75

Reorder the terms:
-75 + 75 + 4x + x2 = 0 + 75

Combine like terms: -75 + 75 = 0
0 + 4x + x2 = 0 + 75
4x + x2 = 0 + 75

Combine like terms: 0 + 75 = 75
4x + x2 = 75

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 75 + 4

Reorder the terms:
4 + 4x + x2 = 75 + 4

Combine like terms: 75 + 4 = 79
4 + 4x + x2 = 79

Factor a perfect square on the left side:
(x + 2)(x + 2) = 79

Calculate the square root of the right side: 8.888194417

Break this problem into two subproblems by setting 
(x + 2) equal to 8.888194417 and -8.888194417.

Subproblem 1

x + 2 = 8.888194417 Simplifying x + 2 = 8.888194417 Reorder the terms: 2 + x = 8.888194417 Solving 2 + x = 8.888194417 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 8.888194417 + -2 Combine like terms: 2 + -2 = 0 0 + x = 8.888194417 + -2 x = 8.888194417 + -2 Combine like terms: 8.888194417 + -2 = 6.888194417 x = 6.888194417 Simplifying x = 6.888194417

Subproblem 2

x + 2 = -8.888194417 Simplifying x + 2 = -8.888194417 Reorder the terms: 2 + x = -8.888194417 Solving 2 + x = -8.888194417 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -8.888194417 + -2 Combine like terms: 2 + -2 = 0 0 + x = -8.888194417 + -2 x = -8.888194417 + -2 Combine like terms: -8.888194417 + -2 = -10.888194417 x = -10.888194417 Simplifying x = -10.888194417

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.888194417, -10.888194417}

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