5x(x-2)=4

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


Simplifying
5x(x + -2) = 4

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

Solving
-10x + 5x2 = 4

Solving for variable 'x'.

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

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

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

Divide each side by '5'.
-0.8 + -2x + x2 = 0

Move the constant term to the right:

Add '0.8' to each side of the equation.
-0.8 + -2x + 0.8 + x2 = 0 + 0.8

Reorder the terms:
-0.8 + 0.8 + -2x + x2 = 0 + 0.8

Combine like terms: -0.8 + 0.8 = 0.0
0.0 + -2x + x2 = 0 + 0.8
-2x + x2 = 0 + 0.8

Combine like terms: 0 + 0.8 = 0.8
-2x + x2 = 0.8

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 0.8 + 1

Reorder the terms:
1 + -2x + x2 = 0.8 + 1

Combine like terms: 0.8 + 1 = 1.8
1 + -2x + x2 = 1.8

Factor a perfect square on the left side:
(x + -1)(x + -1) = 1.8

Calculate the square root of the right side: 1.341640787

Break this problem into two subproblems by setting 
(x + -1) equal to 1.341640787 and -1.341640787.

Subproblem 1

x + -1 = 1.341640787 Simplifying x + -1 = 1.341640787 Reorder the terms: -1 + x = 1.341640787 Solving -1 + x = 1.341640787 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 1.341640787 + 1 Combine like terms: -1 + 1 = 0 0 + x = 1.341640787 + 1 x = 1.341640787 + 1 Combine like terms: 1.341640787 + 1 = 2.341640787 x = 2.341640787 Simplifying x = 2.341640787

Subproblem 2

x + -1 = -1.341640787 Simplifying x + -1 = -1.341640787 Reorder the terms: -1 + x = -1.341640787 Solving -1 + x = -1.341640787 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -1.341640787 + 1 Combine like terms: -1 + 1 = 0 0 + x = -1.341640787 + 1 x = -1.341640787 + 1 Combine like terms: -1.341640787 + 1 = -0.341640787 x = -0.341640787 Simplifying x = -0.341640787

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.341640787, -0.341640787}

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