8x-7=5x(x-2)

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Solution for 8x-7=5x(x-2) equation:


Simplifying
8x + -7 = 5x(x + -2)

Reorder the terms:
-7 + 8x = 5x(x + -2)

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

Solving
-7 + 8x = -10x + 5x2

Solving for variable 'x'.

Combine like terms: 8x + 10x = 18x
-7 + 18x + -5x2 = -10x + 5x2 + 10x + -5x2

Reorder the terms:
-7 + 18x + -5x2 = -10x + 10x + 5x2 + -5x2

Combine like terms: -10x + 10x = 0
-7 + 18x + -5x2 = 0 + 5x2 + -5x2
-7 + 18x + -5x2 = 5x2 + -5x2

Combine like terms: 5x2 + -5x2 = 0
-7 + 18x + -5x2 = 0

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

Divide each side by '-5'.
1.4 + -3.6x + x2 = 0

Move the constant term to the right:

Add '-1.4' to each side of the equation.
1.4 + -3.6x + -1.4 + x2 = 0 + -1.4

Reorder the terms:
1.4 + -1.4 + -3.6x + x2 = 0 + -1.4

Combine like terms: 1.4 + -1.4 = 0.0
0.0 + -3.6x + x2 = 0 + -1.4
-3.6x + x2 = 0 + -1.4

Combine like terms: 0 + -1.4 = -1.4
-3.6x + x2 = -1.4

The x term is -3.6x.  Take half its coefficient (-1.8).
Square it (3.24) and add it to both sides.

Add '3.24' to each side of the equation.
-3.6x + 3.24 + x2 = -1.4 + 3.24

Reorder the terms:
3.24 + -3.6x + x2 = -1.4 + 3.24

Combine like terms: -1.4 + 3.24 = 1.84
3.24 + -3.6x + x2 = 1.84

Factor a perfect square on the left side:
(x + -1.8)(x + -1.8) = 1.84

Calculate the square root of the right side: 1.356465997

Break this problem into two subproblems by setting 
(x + -1.8) equal to 1.356465997 and -1.356465997.

Subproblem 1

x + -1.8 = 1.356465997 Simplifying x + -1.8 = 1.356465997 Reorder the terms: -1.8 + x = 1.356465997 Solving -1.8 + x = 1.356465997 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.8' to each side of the equation. -1.8 + 1.8 + x = 1.356465997 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + x = 1.356465997 + 1.8 x = 1.356465997 + 1.8 Combine like terms: 1.356465997 + 1.8 = 3.156465997 x = 3.156465997 Simplifying x = 3.156465997

Subproblem 2

x + -1.8 = -1.356465997 Simplifying x + -1.8 = -1.356465997 Reorder the terms: -1.8 + x = -1.356465997 Solving -1.8 + x = -1.356465997 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.8' to each side of the equation. -1.8 + 1.8 + x = -1.356465997 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + x = -1.356465997 + 1.8 x = -1.356465997 + 1.8 Combine like terms: -1.356465997 + 1.8 = 0.443534003 x = 0.443534003 Simplifying x = 0.443534003

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.156465997, 0.443534003}

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