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

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


Simplifying
(5x2 + 5x + 8) + (8x2 + 8x) = 0

Reorder the terms:
(8 + 5x + 5x2) + (8x2 + 8x) = 0

Remove parenthesis around (8 + 5x + 5x2)
8 + 5x + 5x2 + (8x2 + 8x) = 0

Reorder the terms:
8 + 5x + 5x2 + (8x + 8x2) = 0

Remove parenthesis around (8x + 8x2)
8 + 5x + 5x2 + 8x + 8x2 = 0

Reorder the terms:
8 + 5x + 8x + 5x2 + 8x2 = 0

Combine like terms: 5x + 8x = 13x
8 + 13x + 5x2 + 8x2 = 0

Combine like terms: 5x2 + 8x2 = 13x2
8 + 13x + 13x2 = 0

Solving
8 + 13x + 13x2 = 0

Solving for variable 'x'.

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

Divide each side by '13'.
0.6153846154 + x + x2 = 0

Move the constant term to the right:

Add '-0.6153846154' to each side of the equation.
0.6153846154 + x + -0.6153846154 + x2 = 0 + -0.6153846154

Reorder the terms:
0.6153846154 + -0.6153846154 + x + x2 = 0 + -0.6153846154

Combine like terms: 0.6153846154 + -0.6153846154 = 0.0000000000
0.0000000000 + x + x2 = 0 + -0.6153846154
x + x2 = 0 + -0.6153846154

Combine like terms: 0 + -0.6153846154 = -0.6153846154
x + x2 = -0.6153846154

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + x2 = -0.6153846154 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = -0.6153846154 + 0.25

Combine like terms: -0.6153846154 + 0.25 = -0.3653846154
1.25 + x2 = -0.3653846154

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = -0.3653846154

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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