(15+x)*(10+x)=240

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Solution for (15+x)*(10+x)=240 equation:


Simplifying
(15 + x)(10 + x) = 240

Multiply (15 + x) * (10 + x)
(15(10 + x) + x(10 + x)) = 240
((10 * 15 + x * 15) + x(10 + x)) = 240
((150 + 15x) + x(10 + x)) = 240
(150 + 15x + (10 * x + x * x)) = 240
(150 + 15x + (10x + x2)) = 240

Combine like terms: 15x + 10x = 25x
(150 + 25x + x2) = 240

Solving
150 + 25x + x2 = 240

Solving for variable 'x'.

Reorder the terms:
150 + -240 + 25x + x2 = 240 + -240

Combine like terms: 150 + -240 = -90
-90 + 25x + x2 = 240 + -240

Combine like terms: 240 + -240 = 0
-90 + 25x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '90' to each side of the equation.
-90 + 25x + 90 + x2 = 0 + 90

Reorder the terms:
-90 + 90 + 25x + x2 = 0 + 90

Combine like terms: -90 + 90 = 0
0 + 25x + x2 = 0 + 90
25x + x2 = 0 + 90

Combine like terms: 0 + 90 = 90
25x + x2 = 90

The x term is 25x.  Take half its coefficient (12.5).
Square it (156.25) and add it to both sides.

Add '156.25' to each side of the equation.
25x + 156.25 + x2 = 90 + 156.25

Reorder the terms:
156.25 + 25x + x2 = 90 + 156.25

Combine like terms: 90 + 156.25 = 246.25
156.25 + 25x + x2 = 246.25

Factor a perfect square on the left side:
(x + 12.5)(x + 12.5) = 246.25

Calculate the square root of the right side: 15.692354826

Break this problem into two subproblems by setting 
(x + 12.5) equal to 15.692354826 and -15.692354826.

Subproblem 1

x + 12.5 = 15.692354826 Simplifying x + 12.5 = 15.692354826 Reorder the terms: 12.5 + x = 15.692354826 Solving 12.5 + x = 15.692354826 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12.5' to each side of the equation. 12.5 + -12.5 + x = 15.692354826 + -12.5 Combine like terms: 12.5 + -12.5 = 0.0 0.0 + x = 15.692354826 + -12.5 x = 15.692354826 + -12.5 Combine like terms: 15.692354826 + -12.5 = 3.192354826 x = 3.192354826 Simplifying x = 3.192354826

Subproblem 2

x + 12.5 = -15.692354826 Simplifying x + 12.5 = -15.692354826 Reorder the terms: 12.5 + x = -15.692354826 Solving 12.5 + x = -15.692354826 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12.5' to each side of the equation. 12.5 + -12.5 + x = -15.692354826 + -12.5 Combine like terms: 12.5 + -12.5 = 0.0 0.0 + x = -15.692354826 + -12.5 x = -15.692354826 + -12.5 Combine like terms: -15.692354826 + -12.5 = -28.192354826 x = -28.192354826 Simplifying x = -28.192354826

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.192354826, -28.192354826}

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