7-4x+2(5x+8)x=-2

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Solution for 7-4x+2(5x+8)x=-2 equation:


Simplifying
7 + -4x + 2(5x + 8) * x = -2

Reorder the terms:
7 + -4x + 2(8 + 5x) * x = -2

Reorder the terms for easier multiplication:
7 + -4x + 2x(8 + 5x) = -2
7 + -4x + (8 * 2x + 5x * 2x) = -2
7 + -4x + (16x + 10x2) = -2

Combine like terms: -4x + 16x = 12x
7 + 12x + 10x2 = -2

Solving
7 + 12x + 10x2 = -2

Solving for variable 'x'.

Reorder the terms:
7 + 2 + 12x + 10x2 = -2 + 2

Combine like terms: 7 + 2 = 9
9 + 12x + 10x2 = -2 + 2

Combine like terms: -2 + 2 = 0
9 + 12x + 10x2 = 0

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

Divide each side by '10'.
0.9 + 1.2x + x2 = 0.0

Move the constant term to the right:

Add '-0.9' to each side of the equation.
0.9 + 1.2x + -0.9 + x2 = 0.0 + -0.9

Reorder the terms:
0.9 + -0.9 + 1.2x + x2 = 0.0 + -0.9

Combine like terms: 0.9 + -0.9 = 0.0
0.0 + 1.2x + x2 = 0.0 + -0.9
1.2x + x2 = 0.0 + -0.9

Combine like terms: 0.0 + -0.9 = -0.9
1.2x + x2 = -0.9

The x term is 1.2x.  Take half its coefficient (0.6).
Square it (0.36) and add it to both sides.

Add '0.36' to each side of the equation.
1.2x + 0.36 + x2 = -0.9 + 0.36

Reorder the terms:
0.36 + 1.2x + x2 = -0.9 + 0.36

Combine like terms: -0.9 + 0.36 = -0.54
0.36 + 1.2x + x2 = -0.54

Factor a perfect square on the left side:
(x + 0.6)(x + 0.6) = -0.54

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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