x(x+10)=720

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Solution for x(x+10)=720 equation:


Simplifying
x(x + 10) = 720

Reorder the terms:
x(10 + x) = 720
(10 * x + x * x) = 720
(10x + x2) = 720

Solving
10x + x2 = 720

Solving for variable 'x'.

Reorder the terms:
-720 + 10x + x2 = 720 + -720

Combine like terms: 720 + -720 = 0
-720 + 10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '720' to each side of the equation.
-720 + 10x + 720 + x2 = 0 + 720

Reorder the terms:
-720 + 720 + 10x + x2 = 0 + 720

Combine like terms: -720 + 720 = 0
0 + 10x + x2 = 0 + 720
10x + x2 = 0 + 720

Combine like terms: 0 + 720 = 720
10x + x2 = 720

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 = 720 + 25

Reorder the terms:
25 + 10x + x2 = 720 + 25

Combine like terms: 720 + 25 = 745
25 + 10x + x2 = 745

Factor a perfect square on the left side:
(x + 5)(x + 5) = 745

Calculate the square root of the right side: 27.294688128

Break this problem into two subproblems by setting 
(x + 5) equal to 27.294688128 and -27.294688128.

Subproblem 1

x + 5 = 27.294688128 Simplifying x + 5 = 27.294688128 Reorder the terms: 5 + x = 27.294688128 Solving 5 + x = 27.294688128 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 = 27.294688128 + -5 Combine like terms: 5 + -5 = 0 0 + x = 27.294688128 + -5 x = 27.294688128 + -5 Combine like terms: 27.294688128 + -5 = 22.294688128 x = 22.294688128 Simplifying x = 22.294688128

Subproblem 2

x + 5 = -27.294688128 Simplifying x + 5 = -27.294688128 Reorder the terms: 5 + x = -27.294688128 Solving 5 + x = -27.294688128 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 = -27.294688128 + -5 Combine like terms: 5 + -5 = 0 0 + x = -27.294688128 + -5 x = -27.294688128 + -5 Combine like terms: -27.294688128 + -5 = -32.294688128 x = -32.294688128 Simplifying x = -32.294688128

Solution

The solution to the problem is based on the solutions from the subproblems. x = {22.294688128, -32.294688128}

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