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

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


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

Reorder the terms:
7 = (-5 + 2x)(2x)

Remove parenthesis around (2x)
7 = (-5 + 2x) * 2x

Reorder the terms for easier multiplication:
7 = 2x(-5 + 2x)
7 = (-5 * 2x + 2x * 2x)
7 = (-10x + 4x2)

Solving
7 = -10x + 4x2

Solving for variable 'x'.

Reorder the terms:
7 + 10x + -4x2 = -10x + 10x + 4x2 + -4x2

Combine like terms: -10x + 10x = 0
7 + 10x + -4x2 = 0 + 4x2 + -4x2
7 + 10x + -4x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
7 + 10x + -4x2 = 0

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-1.75 + -2.5x + x2 = 0

Move the constant term to the right:

Add '1.75' to each side of the equation.
-1.75 + -2.5x + 1.75 + x2 = 0 + 1.75

Reorder the terms:
-1.75 + 1.75 + -2.5x + x2 = 0 + 1.75

Combine like terms: -1.75 + 1.75 = 0.00
0.00 + -2.5x + x2 = 0 + 1.75
-2.5x + x2 = 0 + 1.75

Combine like terms: 0 + 1.75 = 1.75
-2.5x + x2 = 1.75

The x term is -2.5x.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5x + 1.5625 + x2 = 1.75 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = 1.75 + 1.5625

Combine like terms: 1.75 + 1.5625 = 3.3125
1.5625 + -2.5x + x2 = 3.3125

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = 3.3125

Calculate the square root of the right side: 1.820027472

Break this problem into two subproblems by setting 
(x + -1.25) equal to 1.820027472 and -1.820027472.

Subproblem 1

x + -1.25 = 1.820027472 Simplifying x + -1.25 = 1.820027472 Reorder the terms: -1.25 + x = 1.820027472 Solving -1.25 + x = 1.820027472 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = 1.820027472 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 1.820027472 + 1.25 x = 1.820027472 + 1.25 Combine like terms: 1.820027472 + 1.25 = 3.070027472 x = 3.070027472 Simplifying x = 3.070027472

Subproblem 2

x + -1.25 = -1.820027472 Simplifying x + -1.25 = -1.820027472 Reorder the terms: -1.25 + x = -1.820027472 Solving -1.25 + x = -1.820027472 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = -1.820027472 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = -1.820027472 + 1.25 x = -1.820027472 + 1.25 Combine like terms: -1.820027472 + 1.25 = -0.570027472 x = -0.570027472 Simplifying x = -0.570027472

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.070027472, -0.570027472}

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