2x(x+4)=5x-8

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Solution for 2x(x+4)=5x-8 equation: 


Simplifying
2x(x + 4) = 5x + -8

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

Reorder the terms:
8x + 2x2 = -8 + 5x

Solving
8x + 2x2 = -8 + 5x

Solving for variable 'x'.

Reorder the terms:
8 + 8x + -5x + 2x2 = -8 + 5x + 8 + -5x

Combine like terms: 8x + -5x = 3x
8 + 3x + 2x2 = -8 + 5x + 8 + -5x

Reorder the terms:
8 + 3x + 2x2 = -8 + 8 + 5x + -5x

Combine like terms: -8 + 8 = 0
8 + 3x + 2x2 = 0 + 5x + -5x
8 + 3x + 2x2 = 5x + -5x

Combine like terms: 5x + -5x = 0
8 + 3x + 2x2 = 0

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

Divide each side by '2'.
4 + 1.5x + x2 = 0

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + 1.5x + -4 + x2 = 0 + -4

Reorder the terms:
4 + -4 + 1.5x + x2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + 1.5x + x2 = 0 + -4
1.5x + x2 = 0 + -4

Combine like terms: 0 + -4 = -4
1.5x + x2 = -4

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = -4 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = -4 + 0.5625

Combine like terms: -4 + 0.5625 = -3.4375
0.5625 + 1.5x + x2 = -3.4375

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = -3.4375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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