3x^2+5x^2=-3x-5

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Solution for 3x^2+5x^2=-3x-5 equation:


Simplifying
3x2 + 5x2 = -3x + -5

Combine like terms: 3x2 + 5x2 = 8x2
8x2 = -3x + -5

Reorder the terms:
8x2 = -5 + -3x

Solving
8x2 = -5 + -3x

Solving for variable 'x'.

Reorder the terms:
5 + 3x + 8x2 = -5 + -3x + 5 + 3x

Reorder the terms:
5 + 3x + 8x2 = -5 + 5 + -3x + 3x

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

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

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

Divide each side by '8'.
0.625 + 0.375x + x2 = 0

Move the constant term to the right:

Add '-0.625' to each side of the equation.
0.625 + 0.375x + -0.625 + x2 = 0 + -0.625

Reorder the terms:
0.625 + -0.625 + 0.375x + x2 = 0 + -0.625

Combine like terms: 0.625 + -0.625 = 0.000
0.000 + 0.375x + x2 = 0 + -0.625
0.375x + x2 = 0 + -0.625

Combine like terms: 0 + -0.625 = -0.625
0.375x + x2 = -0.625

The x term is 0.375x.  Take half its coefficient (0.1875).
Square it (0.03515625) and add it to both sides.

Add '0.03515625' to each side of the equation.
0.375x + 0.03515625 + x2 = -0.625 + 0.03515625

Reorder the terms:
0.03515625 + 0.375x + x2 = -0.625 + 0.03515625

Combine like terms: -0.625 + 0.03515625 = -0.58984375
0.03515625 + 0.375x + x2 = -0.58984375

Factor a perfect square on the left side:
(x + 0.1875)(x + 0.1875) = -0.58984375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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