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

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


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

Reorder the terms:
-7 + 3x = 5x(2 + -4x)
-7 + 3x = (2 * 5x + -4x * 5x)
-7 + 3x = (10x + -20x2)

Solving
-7 + 3x = 10x + -20x2

Solving for variable 'x'.

Combine like terms: 3x + -10x = -7x
-7 + -7x + 20x2 = 10x + -20x2 + -10x + 20x2

Reorder the terms:
-7 + -7x + 20x2 = 10x + -10x + -20x2 + 20x2

Combine like terms: 10x + -10x = 0
-7 + -7x + 20x2 = 0 + -20x2 + 20x2
-7 + -7x + 20x2 = -20x2 + 20x2

Combine like terms: -20x2 + 20x2 = 0
-7 + -7x + 20x2 = 0

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

Divide each side by '20'.
-0.35 + -0.35x + x2 = 0

Move the constant term to the right:

Add '0.35' to each side of the equation.
-0.35 + -0.35x + 0.35 + x2 = 0 + 0.35

Reorder the terms:
-0.35 + 0.35 + -0.35x + x2 = 0 + 0.35

Combine like terms: -0.35 + 0.35 = 0.00
0.00 + -0.35x + x2 = 0 + 0.35
-0.35x + x2 = 0 + 0.35

Combine like terms: 0 + 0.35 = 0.35
-0.35x + x2 = 0.35

The x term is -0.35x.  Take half its coefficient (-0.175).
Square it (0.030625) and add it to both sides.

Add '0.030625' to each side of the equation.
-0.35x + 0.030625 + x2 = 0.35 + 0.030625

Reorder the terms:
0.030625 + -0.35x + x2 = 0.35 + 0.030625

Combine like terms: 0.35 + 0.030625 = 0.380625
0.030625 + -0.35x + x2 = 0.380625

Factor a perfect square on the left side:
(x + -0.175)(x + -0.175) = 0.380625

Calculate the square root of the right side: 0.616948134

Break this problem into two subproblems by setting 
(x + -0.175) equal to 0.616948134 and -0.616948134.

Subproblem 1

x + -0.175 = 0.616948134 Simplifying x + -0.175 = 0.616948134 Reorder the terms: -0.175 + x = 0.616948134 Solving -0.175 + x = 0.616948134 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.175' to each side of the equation. -0.175 + 0.175 + x = 0.616948134 + 0.175 Combine like terms: -0.175 + 0.175 = 0.000 0.000 + x = 0.616948134 + 0.175 x = 0.616948134 + 0.175 Combine like terms: 0.616948134 + 0.175 = 0.791948134 x = 0.791948134 Simplifying x = 0.791948134

Subproblem 2

x + -0.175 = -0.616948134 Simplifying x + -0.175 = -0.616948134 Reorder the terms: -0.175 + x = -0.616948134 Solving -0.175 + x = -0.616948134 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.175' to each side of the equation. -0.175 + 0.175 + x = -0.616948134 + 0.175 Combine like terms: -0.175 + 0.175 = 0.000 0.000 + x = -0.616948134 + 0.175 x = -0.616948134 + 0.175 Combine like terms: -0.616948134 + 0.175 = -0.441948134 x = -0.441948134 Simplifying x = -0.441948134

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.791948134, -0.441948134}

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