x^2+20x=75

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Solution for x^2+20x=75 equation:


Simplifying
x2 + 20x = 75

Reorder the terms:
20x + x2 = 75

Solving
20x + x2 = 75

Solving for variable 'x'.

Reorder the terms:
-75 + 20x + x2 = 75 + -75

Combine like terms: 75 + -75 = 0
-75 + 20x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '75' to each side of the equation.
-75 + 20x + 75 + x2 = 0 + 75

Reorder the terms:
-75 + 75 + 20x + x2 = 0 + 75

Combine like terms: -75 + 75 = 0
0 + 20x + x2 = 0 + 75
20x + x2 = 0 + 75

Combine like terms: 0 + 75 = 75
20x + x2 = 75

The x term is 20x.  Take half its coefficient (10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
20x + 100 + x2 = 75 + 100

Reorder the terms:
100 + 20x + x2 = 75 + 100

Combine like terms: 75 + 100 = 175
100 + 20x + x2 = 175

Factor a perfect square on the left side:
(x + 10)(x + 10) = 175

Calculate the square root of the right side: 13.228756555

Break this problem into two subproblems by setting 
(x + 10) equal to 13.228756555 and -13.228756555.

Subproblem 1

x + 10 = 13.228756555 Simplifying x + 10 = 13.228756555 Reorder the terms: 10 + x = 13.228756555 Solving 10 + x = 13.228756555 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = 13.228756555 + -10 Combine like terms: 10 + -10 = 0 0 + x = 13.228756555 + -10 x = 13.228756555 + -10 Combine like terms: 13.228756555 + -10 = 3.228756555 x = 3.228756555 Simplifying x = 3.228756555

Subproblem 2

x + 10 = -13.228756555 Simplifying x + 10 = -13.228756555 Reorder the terms: 10 + x = -13.228756555 Solving 10 + x = -13.228756555 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = -13.228756555 + -10 Combine like terms: 10 + -10 = 0 0 + x = -13.228756555 + -10 x = -13.228756555 + -10 Combine like terms: -13.228756555 + -10 = -23.228756555 x = -23.228756555 Simplifying x = -23.228756555

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.228756555, -23.228756555}

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