(x+5)(x-2)=240

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Solution for (x+5)(x-2)=240 equation:


Simplifying
(x + 5)(x + -2) = 240

Reorder the terms:
(5 + x)(x + -2) = 240

Reorder the terms:
(5 + x)(-2 + x) = 240

Multiply (5 + x) * (-2 + x)
(5(-2 + x) + x(-2 + x)) = 240
((-2 * 5 + x * 5) + x(-2 + x)) = 240
((-10 + 5x) + x(-2 + x)) = 240
(-10 + 5x + (-2 * x + x * x)) = 240
(-10 + 5x + (-2x + x2)) = 240

Combine like terms: 5x + -2x = 3x
(-10 + 3x + x2) = 240

Solving
-10 + 3x + x2 = 240

Solving for variable 'x'.

Reorder the terms:
-10 + -240 + 3x + x2 = 240 + -240

Combine like terms: -10 + -240 = -250
-250 + 3x + x2 = 240 + -240

Combine like terms: 240 + -240 = 0
-250 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '250' to each side of the equation.
-250 + 3x + 250 + x2 = 0 + 250

Reorder the terms:
-250 + 250 + 3x + x2 = 0 + 250

Combine like terms: -250 + 250 = 0
0 + 3x + x2 = 0 + 250
3x + x2 = 0 + 250

Combine like terms: 0 + 250 = 250
3x + x2 = 250

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 250 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 250 + 2.25

Combine like terms: 250 + 2.25 = 252.25
2.25 + 3x + x2 = 252.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 252.25

Calculate the square root of the right side: 15.882380174

Break this problem into two subproblems by setting 
(x + 1.5) equal to 15.882380174 and -15.882380174.

Subproblem 1

x + 1.5 = 15.882380174 Simplifying x + 1.5 = 15.882380174 Reorder the terms: 1.5 + x = 15.882380174 Solving 1.5 + x = 15.882380174 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 15.882380174 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 15.882380174 + -1.5 x = 15.882380174 + -1.5 Combine like terms: 15.882380174 + -1.5 = 14.382380174 x = 14.382380174 Simplifying x = 14.382380174

Subproblem 2

x + 1.5 = -15.882380174 Simplifying x + 1.5 = -15.882380174 Reorder the terms: 1.5 + x = -15.882380174 Solving 1.5 + x = -15.882380174 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -15.882380174 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -15.882380174 + -1.5 x = -15.882380174 + -1.5 Combine like terms: -15.882380174 + -1.5 = -17.382380174 x = -17.382380174 Simplifying x = -17.382380174

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.382380174, -17.382380174}

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