128=5x-2(x+2)(4x+1)

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Solution for 128=5x-2(x+2)(4x+1) equation:


Simplifying
128 = 5x + -2(x + 2)(4x + 1)

Reorder the terms:
128 = 5x + -2(2 + x)(4x + 1)

Reorder the terms:
128 = 5x + -2(2 + x)(1 + 4x)

Multiply (2 + x) * (1 + 4x)
128 = 5x + -2(2(1 + 4x) + x(1 + 4x))
128 = 5x + -2((1 * 2 + 4x * 2) + x(1 + 4x))
128 = 5x + -2((2 + 8x) + x(1 + 4x))
128 = 5x + -2(2 + 8x + (1 * x + 4x * x))
128 = 5x + -2(2 + 8x + (1x + 4x2))

Combine like terms: 8x + 1x = 9x
128 = 5x + -2(2 + 9x + 4x2)
128 = 5x + (2 * -2 + 9x * -2 + 4x2 * -2)
128 = 5x + (-4 + -18x + -8x2)

Reorder the terms:
128 = -4 + 5x + -18x + -8x2

Combine like terms: 5x + -18x = -13x
128 = -4 + -13x + -8x2

Solving
128 = -4 + -13x + -8x2

Solving for variable 'x'.

Combine like terms: 128 + 4 = 132
132 + 13x + 8x2 = -4 + -13x + -8x2 + 4 + 13x + 8x2

Reorder the terms:
132 + 13x + 8x2 = -4 + 4 + -13x + 13x + -8x2 + 8x2

Combine like terms: -4 + 4 = 0
132 + 13x + 8x2 = 0 + -13x + 13x + -8x2 + 8x2
132 + 13x + 8x2 = -13x + 13x + -8x2 + 8x2

Combine like terms: -13x + 13x = 0
132 + 13x + 8x2 = 0 + -8x2 + 8x2
132 + 13x + 8x2 = -8x2 + 8x2

Combine like terms: -8x2 + 8x2 = 0
132 + 13x + 8x2 = 0

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

Divide each side by '8'.
16.5 + 1.625x + x2 = 0

Move the constant term to the right:

Add '-16.5' to each side of the equation.
16.5 + 1.625x + -16.5 + x2 = 0 + -16.5

Reorder the terms:
16.5 + -16.5 + 1.625x + x2 = 0 + -16.5

Combine like terms: 16.5 + -16.5 = 0.0
0.0 + 1.625x + x2 = 0 + -16.5
1.625x + x2 = 0 + -16.5

Combine like terms: 0 + -16.5 = -16.5
1.625x + x2 = -16.5

The x term is 1.625x.  Take half its coefficient (0.8125).
Square it (0.66015625) and add it to both sides.

Add '0.66015625' to each side of the equation.
1.625x + 0.66015625 + x2 = -16.5 + 0.66015625

Reorder the terms:
0.66015625 + 1.625x + x2 = -16.5 + 0.66015625

Combine like terms: -16.5 + 0.66015625 = -15.83984375
0.66015625 + 1.625x + x2 = -15.83984375

Factor a perfect square on the left side:
(x + 0.8125)(x + 0.8125) = -15.83984375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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