3x+7=2x(5x-4)

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Solution for 3x+7=2x(5x-4) equation:


Simplifying
3x + 7 = 2x(5x + -4)

Reorder the terms:
7 + 3x = 2x(5x + -4)

Reorder the terms:
7 + 3x = 2x(-4 + 5x)
7 + 3x = (-4 * 2x + 5x * 2x)
7 + 3x = (-8x + 10x2)

Solving
7 + 3x = -8x + 10x2

Solving for variable 'x'.

Combine like terms: 3x + 8x = 11x
7 + 11x + -10x2 = -8x + 10x2 + 8x + -10x2

Reorder the terms:
7 + 11x + -10x2 = -8x + 8x + 10x2 + -10x2

Combine like terms: -8x + 8x = 0
7 + 11x + -10x2 = 0 + 10x2 + -10x2
7 + 11x + -10x2 = 10x2 + -10x2

Combine like terms: 10x2 + -10x2 = 0
7 + 11x + -10x2 = 0

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

Divide each side by '-10'.
-0.7 + -1.1x + x2 = 0

Move the constant term to the right:

Add '0.7' to each side of the equation.
-0.7 + -1.1x + 0.7 + x2 = 0 + 0.7

Reorder the terms:
-0.7 + 0.7 + -1.1x + x2 = 0 + 0.7

Combine like terms: -0.7 + 0.7 = 0.0
0.0 + -1.1x + x2 = 0 + 0.7
-1.1x + x2 = 0 + 0.7

Combine like terms: 0 + 0.7 = 0.7
-1.1x + x2 = 0.7

The x term is -1.1x.  Take half its coefficient (-0.55).
Square it (0.3025) and add it to both sides.

Add '0.3025' to each side of the equation.
-1.1x + 0.3025 + x2 = 0.7 + 0.3025

Reorder the terms:
0.3025 + -1.1x + x2 = 0.7 + 0.3025

Combine like terms: 0.7 + 0.3025 = 1.0025
0.3025 + -1.1x + x2 = 1.0025

Factor a perfect square on the left side:
(x + -0.55)(x + -0.55) = 1.0025

Calculate the square root of the right side: 1.00124922

Break this problem into two subproblems by setting 
(x + -0.55) equal to 1.00124922 and -1.00124922.

Subproblem 1

x + -0.55 = 1.00124922 Simplifying x + -0.55 = 1.00124922 Reorder the terms: -0.55 + x = 1.00124922 Solving -0.55 + x = 1.00124922 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.55' to each side of the equation. -0.55 + 0.55 + x = 1.00124922 + 0.55 Combine like terms: -0.55 + 0.55 = 0.00 0.00 + x = 1.00124922 + 0.55 x = 1.00124922 + 0.55 Combine like terms: 1.00124922 + 0.55 = 1.55124922 x = 1.55124922 Simplifying x = 1.55124922

Subproblem 2

x + -0.55 = -1.00124922 Simplifying x + -0.55 = -1.00124922 Reorder the terms: -0.55 + x = -1.00124922 Solving -0.55 + x = -1.00124922 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.55' to each side of the equation. -0.55 + 0.55 + x = -1.00124922 + 0.55 Combine like terms: -0.55 + 0.55 = 0.00 0.00 + x = -1.00124922 + 0.55 x = -1.00124922 + 0.55 Combine like terms: -1.00124922 + 0.55 = -0.45124922 x = -0.45124922 Simplifying x = -0.45124922

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.55124922, -0.45124922}

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