(5x+2)(2x-1)=100

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Solution for (5x+2)(2x-1)=100 equation:


Simplifying
(5x + 2)(2x + -1) = 100

Reorder the terms:
(2 + 5x)(2x + -1) = 100

Reorder the terms:
(2 + 5x)(-1 + 2x) = 100

Multiply (2 + 5x) * (-1 + 2x)
(2(-1 + 2x) + 5x * (-1 + 2x)) = 100
((-1 * 2 + 2x * 2) + 5x * (-1 + 2x)) = 100
((-2 + 4x) + 5x * (-1 + 2x)) = 100
(-2 + 4x + (-1 * 5x + 2x * 5x)) = 100
(-2 + 4x + (-5x + 10x2)) = 100

Combine like terms: 4x + -5x = -1x
(-2 + -1x + 10x2) = 100

Solving
-2 + -1x + 10x2 = 100

Solving for variable 'x'.

Reorder the terms:
-2 + -100 + -1x + 10x2 = 100 + -100

Combine like terms: -2 + -100 = -102
-102 + -1x + 10x2 = 100 + -100

Combine like terms: 100 + -100 = 0
-102 + -1x + 10x2 = 0

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

Divide each side by '10'.
-10.2 + -0.1x + x2 = 0.0

Move the constant term to the right:

Add '10.2' to each side of the equation.
-10.2 + -0.1x + 10.2 + x2 = 0.0 + 10.2

Reorder the terms:
-10.2 + 10.2 + -0.1x + x2 = 0.0 + 10.2

Combine like terms: -10.2 + 10.2 = 0.0
0.0 + -0.1x + x2 = 0.0 + 10.2
-0.1x + x2 = 0.0 + 10.2

Combine like terms: 0.0 + 10.2 = 10.2
-0.1x + x2 = 10.2

The x term is -0.1x.  Take half its coefficient (-0.05).
Square it (0.0025) and add it to both sides.

Add '0.0025' to each side of the equation.
-0.1x + 0.0025 + x2 = 10.2 + 0.0025

Reorder the terms:
0.0025 + -0.1x + x2 = 10.2 + 0.0025

Combine like terms: 10.2 + 0.0025 = 10.2025
0.0025 + -0.1x + x2 = 10.2025

Factor a perfect square on the left side:
(x + -0.05)(x + -0.05) = 10.2025

Calculate the square root of the right side: 3.194135251

Break this problem into two subproblems by setting 
(x + -0.05) equal to 3.194135251 and -3.194135251.

Subproblem 1

x + -0.05 = 3.194135251 Simplifying x + -0.05 = 3.194135251 Reorder the terms: -0.05 + x = 3.194135251 Solving -0.05 + x = 3.194135251 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.05' to each side of the equation. -0.05 + 0.05 + x = 3.194135251 + 0.05 Combine like terms: -0.05 + 0.05 = 0.00 0.00 + x = 3.194135251 + 0.05 x = 3.194135251 + 0.05 Combine like terms: 3.194135251 + 0.05 = 3.244135251 x = 3.244135251 Simplifying x = 3.244135251

Subproblem 2

x + -0.05 = -3.194135251 Simplifying x + -0.05 = -3.194135251 Reorder the terms: -0.05 + x = -3.194135251 Solving -0.05 + x = -3.194135251 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.05' to each side of the equation. -0.05 + 0.05 + x = -3.194135251 + 0.05 Combine like terms: -0.05 + 0.05 = 0.00 0.00 + x = -3.194135251 + 0.05 x = -3.194135251 + 0.05 Combine like terms: -3.194135251 + 0.05 = -3.144135251 x = -3.144135251 Simplifying x = -3.144135251

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.244135251, -3.144135251}

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