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

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


Simplifying
(5x2) + 8x = -4

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

Solving
8x + (5x2) = -4

Solving for variable 'x'.

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

Combine like terms: -4 + 4 = 0
4 + 8x + (5x2) = 0

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

Divide each side by '5'.
0.8 + 1.6x + x2 = 0

Move the constant term to the right:

Add '-0.8' to each side of the equation.
0.8 + 1.6x + -0.8 + x2 = 0 + -0.8

Reorder the terms:
0.8 + -0.8 + 1.6x + x2 = 0 + -0.8

Combine like terms: 0.8 + -0.8 = 0.0
0.0 + 1.6x + x2 = 0 + -0.8
1.6x + x2 = 0 + -0.8

Combine like terms: 0 + -0.8 = -0.8
1.6x + x2 = -0.8

The x term is 1.6x.  Take half its coefficient (0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
1.6x + 0.64 + x2 = -0.8 + 0.64

Reorder the terms:
0.64 + 1.6x + x2 = -0.8 + 0.64

Combine like terms: -0.8 + 0.64 = -0.16
0.64 + 1.6x + x2 = -0.16

Factor a perfect square on the left side:
((x) + 0.8)((x) + 0.8) = -0.16

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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