x*(x+10)=880

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Solution for x*(x+10)=880 equation:


Simplifying
x(x + 10) = 880

Reorder the terms:
x(10 + x) = 880
(10 * x + x * x) = 880
(10x + x2) = 880

Solving
10x + x2 = 880

Solving for variable 'x'.

Reorder the terms:
-880 + 10x + x2 = 880 + -880

Combine like terms: 880 + -880 = 0
-880 + 10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '880' to each side of the equation.
-880 + 10x + 880 + x2 = 0 + 880

Reorder the terms:
-880 + 880 + 10x + x2 = 0 + 880

Combine like terms: -880 + 880 = 0
0 + 10x + x2 = 0 + 880
10x + x2 = 0 + 880

Combine like terms: 0 + 880 = 880
10x + x2 = 880

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 = 880 + 25

Reorder the terms:
25 + 10x + x2 = 880 + 25

Combine like terms: 880 + 25 = 905
25 + 10x + x2 = 905

Factor a perfect square on the left side:
(x + 5)(x + 5) = 905

Calculate the square root of the right side: 30.083217913

Break this problem into two subproblems by setting 
(x + 5) equal to 30.083217913 and -30.083217913.

Subproblem 1

x + 5 = 30.083217913 Simplifying x + 5 = 30.083217913 Reorder the terms: 5 + x = 30.083217913 Solving 5 + x = 30.083217913 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 = 30.083217913 + -5 Combine like terms: 5 + -5 = 0 0 + x = 30.083217913 + -5 x = 30.083217913 + -5 Combine like terms: 30.083217913 + -5 = 25.083217913 x = 25.083217913 Simplifying x = 25.083217913

Subproblem 2

x + 5 = -30.083217913 Simplifying x + 5 = -30.083217913 Reorder the terms: 5 + x = -30.083217913 Solving 5 + x = -30.083217913 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 = -30.083217913 + -5 Combine like terms: 5 + -5 = 0 0 + x = -30.083217913 + -5 x = -30.083217913 + -5 Combine like terms: -30.083217913 + -5 = -35.083217913 x = -35.083217913 Simplifying x = -35.083217913

Solution

The solution to the problem is based on the solutions from the subproblems. x = {25.083217913, -35.083217913}

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