8x-5x(x-1)=20

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Solution for 8x-5x(x-1)=20 equation:


Simplifying
8x + -5x(x + -1) = 20

Reorder the terms:
8x + -5x(-1 + x) = 20
8x + (-1 * -5x + x * -5x) = 20
8x + (5x + -5x2) = 20

Combine like terms: 8x + 5x = 13x
13x + -5x2 = 20

Solving
13x + -5x2 = 20

Solving for variable 'x'.

Reorder the terms:
-20 + 13x + -5x2 = 20 + -20

Combine like terms: 20 + -20 = 0
-20 + 13x + -5x2 = 0

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

Divide each side by '-5'.
4 + -2.6x + x2 = 0

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + -2.6x + -4 + x2 = 0 + -4

Reorder the terms:
4 + -4 + -2.6x + x2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -2.6x + x2 = 0 + -4
-2.6x + x2 = 0 + -4

Combine like terms: 0 + -4 = -4
-2.6x + x2 = -4

The x term is -2.6x.  Take half its coefficient (-1.3).
Square it (1.69) and add it to both sides.

Add '1.69' to each side of the equation.
-2.6x + 1.69 + x2 = -4 + 1.69

Reorder the terms:
1.69 + -2.6x + x2 = -4 + 1.69

Combine like terms: -4 + 1.69 = -2.31
1.69 + -2.6x + x2 = -2.31

Factor a perfect square on the left side:
(x + -1.3)(x + -1.3) = -2.31

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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