(2x+3)(x-5)=10

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Solution for (2x+3)(x-5)=10 equation:


Simplifying
(2x + 3)(x + -5) = 10

Reorder the terms:
(3 + 2x)(x + -5) = 10

Reorder the terms:
(3 + 2x)(-5 + x) = 10

Multiply (3 + 2x) * (-5 + x)
(3(-5 + x) + 2x * (-5 + x)) = 10
((-5 * 3 + x * 3) + 2x * (-5 + x)) = 10
((-15 + 3x) + 2x * (-5 + x)) = 10
(-15 + 3x + (-5 * 2x + x * 2x)) = 10
(-15 + 3x + (-10x + 2x2)) = 10

Combine like terms: 3x + -10x = -7x
(-15 + -7x + 2x2) = 10

Solving
-15 + -7x + 2x2 = 10

Solving for variable 'x'.

Reorder the terms:
-15 + -10 + -7x + 2x2 = 10 + -10

Combine like terms: -15 + -10 = -25
-25 + -7x + 2x2 = 10 + -10

Combine like terms: 10 + -10 = 0
-25 + -7x + 2x2 = 0

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
-12.5 + -3.5x + x2 = 0

Move the constant term to the right:

Add '12.5' to each side of the equation.
-12.5 + -3.5x + 12.5 + x2 = 0 + 12.5

Reorder the terms:
-12.5 + 12.5 + -3.5x + x2 = 0 + 12.5

Combine like terms: -12.5 + 12.5 = 0.0
0.0 + -3.5x + x2 = 0 + 12.5
-3.5x + x2 = 0 + 12.5

Combine like terms: 0 + 12.5 = 12.5
-3.5x + x2 = 12.5

The x term is -3.5x.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5x + 3.0625 + x2 = 12.5 + 3.0625

Reorder the terms:
3.0625 + -3.5x + x2 = 12.5 + 3.0625

Combine like terms: 12.5 + 3.0625 = 15.5625
3.0625 + -3.5x + x2 = 15.5625

Factor a perfect square on the left side:
(x + -1.75)(x + -1.75) = 15.5625

Calculate the square root of the right side: 3.94493346

Break this problem into two subproblems by setting 
(x + -1.75) equal to 3.94493346 and -3.94493346.

Subproblem 1

x + -1.75 = 3.94493346 Simplifying x + -1.75 = 3.94493346 Reorder the terms: -1.75 + x = 3.94493346 Solving -1.75 + x = 3.94493346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = 3.94493346 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = 3.94493346 + 1.75 x = 3.94493346 + 1.75 Combine like terms: 3.94493346 + 1.75 = 5.69493346 x = 5.69493346 Simplifying x = 5.69493346

Subproblem 2

x + -1.75 = -3.94493346 Simplifying x + -1.75 = -3.94493346 Reorder the terms: -1.75 + x = -3.94493346 Solving -1.75 + x = -3.94493346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = -3.94493346 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = -3.94493346 + 1.75 x = -3.94493346 + 1.75 Combine like terms: -3.94493346 + 1.75 = -2.19493346 x = -2.19493346 Simplifying x = -2.19493346

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.69493346, -2.19493346}

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