x^2+10x=72

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Solution for x^2+10x=72 equation:


Simplifying
x2 + 10x = 72

Reorder the terms:
10x + x2 = 72

Solving
10x + x2 = 72

Solving for variable 'x'.

Reorder the terms:
-72 + 10x + x2 = 72 + -72

Combine like terms: 72 + -72 = 0
-72 + 10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '72' to each side of the equation.
-72 + 10x + 72 + x2 = 0 + 72

Reorder the terms:
-72 + 72 + 10x + x2 = 0 + 72

Combine like terms: -72 + 72 = 0
0 + 10x + x2 = 0 + 72
10x + x2 = 0 + 72

Combine like terms: 0 + 72 = 72
10x + x2 = 72

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 = 72 + 25

Reorder the terms:
25 + 10x + x2 = 72 + 25

Combine like terms: 72 + 25 = 97
25 + 10x + x2 = 97

Factor a perfect square on the left side:
(x + 5)(x + 5) = 97

Calculate the square root of the right side: 9.848857802

Break this problem into two subproblems by setting 
(x + 5) equal to 9.848857802 and -9.848857802.

Subproblem 1

x + 5 = 9.848857802 Simplifying x + 5 = 9.848857802 Reorder the terms: 5 + x = 9.848857802 Solving 5 + x = 9.848857802 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 = 9.848857802 + -5 Combine like terms: 5 + -5 = 0 0 + x = 9.848857802 + -5 x = 9.848857802 + -5 Combine like terms: 9.848857802 + -5 = 4.848857802 x = 4.848857802 Simplifying x = 4.848857802

Subproblem 2

x + 5 = -9.848857802 Simplifying x + 5 = -9.848857802 Reorder the terms: 5 + x = -9.848857802 Solving 5 + x = -9.848857802 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 = -9.848857802 + -5 Combine like terms: 5 + -5 = 0 0 + x = -9.848857802 + -5 x = -9.848857802 + -5 Combine like terms: -9.848857802 + -5 = -14.848857802 x = -14.848857802 Simplifying x = -14.848857802

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.848857802, -14.848857802}

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