(2x+1)(x-5)=10

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Solution for (2x+1)(x-5)=10 equation:


Simplifying
(2x + 1)(x + -5) = 10

Reorder the terms:
(1 + 2x)(x + -5) = 10

Reorder the terms:
(1 + 2x)(-5 + x) = 10

Multiply (1 + 2x) * (-5 + x)
(1(-5 + x) + 2x * (-5 + x)) = 10
((-5 * 1 + x * 1) + 2x * (-5 + x)) = 10
((-5 + 1x) + 2x * (-5 + x)) = 10
(-5 + 1x + (-5 * 2x + x * 2x)) = 10
(-5 + 1x + (-10x + 2x2)) = 10

Combine like terms: 1x + -10x = -9x
(-5 + -9x + 2x2) = 10

Solving
-5 + -9x + 2x2 = 10

Solving for variable 'x'.

Reorder the terms:
-5 + -10 + -9x + 2x2 = 10 + -10

Combine like terms: -5 + -10 = -15
-15 + -9x + 2x2 = 10 + -10

Combine like terms: 10 + -10 = 0
-15 + -9x + 2x2 = 0

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

Divide each side by '2'.
-7.5 + -4.5x + x2 = 0

Move the constant term to the right:

Add '7.5' to each side of the equation.
-7.5 + -4.5x + 7.5 + x2 = 0 + 7.5

Reorder the terms:
-7.5 + 7.5 + -4.5x + x2 = 0 + 7.5

Combine like terms: -7.5 + 7.5 = 0.0
0.0 + -4.5x + x2 = 0 + 7.5
-4.5x + x2 = 0 + 7.5

Combine like terms: 0 + 7.5 = 7.5
-4.5x + x2 = 7.5

The x term is -4.5x.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5x + 5.0625 + x2 = 7.5 + 5.0625

Reorder the terms:
5.0625 + -4.5x + x2 = 7.5 + 5.0625

Combine like terms: 7.5 + 5.0625 = 12.5625
5.0625 + -4.5x + x2 = 12.5625

Factor a perfect square on the left side:
(x + -2.25)(x + -2.25) = 12.5625

Calculate the square root of the right side: 3.54436172

Break this problem into two subproblems by setting 
(x + -2.25) equal to 3.54436172 and -3.54436172.

Subproblem 1

x + -2.25 = 3.54436172 Simplifying x + -2.25 = 3.54436172 Reorder the terms: -2.25 + x = 3.54436172 Solving -2.25 + x = 3.54436172 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = 3.54436172 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = 3.54436172 + 2.25 x = 3.54436172 + 2.25 Combine like terms: 3.54436172 + 2.25 = 5.79436172 x = 5.79436172 Simplifying x = 5.79436172

Subproblem 2

x + -2.25 = -3.54436172 Simplifying x + -2.25 = -3.54436172 Reorder the terms: -2.25 + x = -3.54436172 Solving -2.25 + x = -3.54436172 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = -3.54436172 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = -3.54436172 + 2.25 x = -3.54436172 + 2.25 Combine like terms: -3.54436172 + 2.25 = -1.29436172 x = -1.29436172 Simplifying x = -1.29436172

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.79436172, -1.29436172}

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