-3+8x^2-x+8+7x^2+2x=

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Solution for -3+8x^2-x+8+7x^2+2x= equation: 


Simplifying
-3 + 8x2 + -1x + 8 + 7x2 + 2x = 0

Reorder the terms:
-3 + 8 + -1x + 2x + 8x2 + 7x2 = 0

Combine like terms: -3 + 8 = 5
5 + -1x + 2x + 8x2 + 7x2 = 0

Combine like terms: -1x + 2x = 1x
5 + 1x + 8x2 + 7x2 = 0

Combine like terms: 8x2 + 7x2 = 15x2
5 + 1x + 15x2 = 0

Solving
5 + 1x + 15x2 = 0

Solving for variable 'x'.

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

Divide each side by '15'.
0.3333333333 + 0.06666666667x + x2 = 0

Move the constant term to the right:

Add '-0.3333333333' to each side of the equation.
0.3333333333 + 0.06666666667x + -0.3333333333 + x2 = 0 + -0.3333333333

Reorder the terms:
0.3333333333 + -0.3333333333 + 0.06666666667x + x2 = 0 + -0.3333333333

Combine like terms: 0.3333333333 + -0.3333333333 = 0.0000000000
0.0000000000 + 0.06666666667x + x2 = 0 + -0.3333333333
0.06666666667x + x2 = 0 + -0.3333333333

Combine like terms: 0 + -0.3333333333 = -0.3333333333
0.06666666667x + x2 = -0.3333333333

The x term is 0.06666666667x.  Take half its coefficient (0.03333333334).
Square it (0.001111111112) and add it to both sides.

Add '0.001111111112' to each side of the equation.
0.06666666667x + 0.001111111112 + x2 = -0.3333333333 + 0.001111111112

Reorder the terms:
0.001111111112 + 0.06666666667x + x2 = -0.3333333333 + 0.001111111112

Combine like terms: -0.3333333333 + 0.001111111112 = -0.332222222188
0.001111111112 + 0.06666666667x + x2 = -0.332222222188

Factor a perfect square on the left side:
(x + 0.03333333334)(x + 0.03333333334) = -0.332222222188

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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