x*(x+10)=120

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Solution for x*(x+10)=120 equation:


Simplifying
x(x + 10) = 120

Reorder the terms:
x(10 + x) = 120
(10 * x + x * x) = 120
(10x + x2) = 120

Solving
10x + x2 = 120

Solving for variable 'x'.

Reorder the terms:
-120 + 10x + x2 = 120 + -120

Combine like terms: 120 + -120 = 0
-120 + 10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '120' to each side of the equation.
-120 + 10x + 120 + x2 = 0 + 120

Reorder the terms:
-120 + 120 + 10x + x2 = 0 + 120

Combine like terms: -120 + 120 = 0
0 + 10x + x2 = 0 + 120
10x + x2 = 0 + 120

Combine like terms: 0 + 120 = 120
10x + x2 = 120

The x term is 10x.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10x + 25 + x2 = 120 + 25

Reorder the terms:
25 + 10x + x2 = 120 + 25

Combine like terms: 120 + 25 = 145
25 + 10x + x2 = 145

Factor a perfect square on the left side:
(x + 5)(x + 5) = 145

Calculate the square root of the right side: 12.041594579

Break this problem into two subproblems by setting 
(x + 5) equal to 12.041594579 and -12.041594579.

Subproblem 1

x + 5 = 12.041594579 Simplifying x + 5 = 12.041594579 Reorder the terms: 5 + x = 12.041594579 Solving 5 + x = 12.041594579 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 12.041594579 + -5 Combine like terms: 5 + -5 = 0 0 + x = 12.041594579 + -5 x = 12.041594579 + -5 Combine like terms: 12.041594579 + -5 = 7.041594579 x = 7.041594579 Simplifying x = 7.041594579

Subproblem 2

x + 5 = -12.041594579 Simplifying x + 5 = -12.041594579 Reorder the terms: 5 + x = -12.041594579 Solving 5 + x = -12.041594579 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = -12.041594579 + -5 Combine like terms: 5 + -5 = 0 0 + x = -12.041594579 + -5 x = -12.041594579 + -5 Combine like terms: -12.041594579 + -5 = -17.041594579 x = -17.041594579 Simplifying x = -17.041594579

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.041594579, -17.041594579}

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