2x(5x-7)=2x*2-5

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Solution for 2x(5x-7)=2x*2-5 equation:


Simplifying
2x(5x + -7) = 2x * 2 + -5

Reorder the terms:
2x(-7 + 5x) = 2x * 2 + -5
(-7 * 2x + 5x * 2x) = 2x * 2 + -5
(-14x + 10x2) = 2x * 2 + -5

Reorder the terms for easier multiplication:
-14x + 10x2 = 2 * 2x + -5

Multiply 2 * 2
-14x + 10x2 = 4x + -5

Reorder the terms:
-14x + 10x2 = -5 + 4x

Solving
-14x + 10x2 = -5 + 4x

Solving for variable 'x'.

Reorder the terms:
5 + -14x + -4x + 10x2 = -5 + 4x + 5 + -4x

Combine like terms: -14x + -4x = -18x
5 + -18x + 10x2 = -5 + 4x + 5 + -4x

Reorder the terms:
5 + -18x + 10x2 = -5 + 5 + 4x + -4x

Combine like terms: -5 + 5 = 0
5 + -18x + 10x2 = 0 + 4x + -4x
5 + -18x + 10x2 = 4x + -4x

Combine like terms: 4x + -4x = 0
5 + -18x + 10x2 = 0

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

Divide each side by '10'.
0.5 + -1.8x + x2 = 0.0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + -1.8x + -0.5 + x2 = 0.0 + -0.5

Reorder the terms:
0.5 + -0.5 + -1.8x + x2 = 0.0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + -1.8x + x2 = 0.0 + -0.5
-1.8x + x2 = 0.0 + -0.5

Combine like terms: 0.0 + -0.5 = -0.5
-1.8x + x2 = -0.5

The x term is -1.8x.  Take half its coefficient (-0.9).
Square it (0.81) and add it to both sides.

Add '0.81' to each side of the equation.
-1.8x + 0.81 + x2 = -0.5 + 0.81

Reorder the terms:
0.81 + -1.8x + x2 = -0.5 + 0.81

Combine like terms: -0.5 + 0.81 = 0.31
0.81 + -1.8x + x2 = 0.31

Factor a perfect square on the left side:
(x + -0.9)(x + -0.9) = 0.31

Calculate the square root of the right side: 0.556776436

Break this problem into two subproblems by setting 
(x + -0.9) equal to 0.556776436 and -0.556776436.

Subproblem 1

x + -0.9 = 0.556776436 Simplifying x + -0.9 = 0.556776436 Reorder the terms: -0.9 + x = 0.556776436 Solving -0.9 + x = 0.556776436 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + x = 0.556776436 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + x = 0.556776436 + 0.9 x = 0.556776436 + 0.9 Combine like terms: 0.556776436 + 0.9 = 1.456776436 x = 1.456776436 Simplifying x = 1.456776436

Subproblem 2

x + -0.9 = -0.556776436 Simplifying x + -0.9 = -0.556776436 Reorder the terms: -0.9 + x = -0.556776436 Solving -0.9 + x = -0.556776436 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + x = -0.556776436 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + x = -0.556776436 + 0.9 x = -0.556776436 + 0.9 Combine like terms: -0.556776436 + 0.9 = 0.343223564 x = 0.343223564 Simplifying x = 0.343223564

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.456776436, 0.343223564}

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