(-2x^2+5)+(7x^2+3x-4)=0

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Solution for (-2x^2+5)+(7x^2+3x-4)=0 equation:


Simplifying
(-2x2 + 5) + (7x2 + 3x + -4) = 0

Reorder the terms:
(5 + -2x2) + (7x2 + 3x + -4) = 0

Remove parenthesis around (5 + -2x2)
5 + -2x2 + (7x2 + 3x + -4) = 0

Reorder the terms:
5 + -2x2 + (-4 + 3x + 7x2) = 0

Remove parenthesis around (-4 + 3x + 7x2)
5 + -2x2 + -4 + 3x + 7x2 = 0

Reorder the terms:
5 + -4 + 3x + -2x2 + 7x2 = 0

Combine like terms: 5 + -4 = 1
1 + 3x + -2x2 + 7x2 = 0

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

Solving
1 + 3x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
0.2 + 0.6x + x2 = 0

Move the constant term to the right:

Add '-0.2' to each side of the equation.
0.2 + 0.6x + -0.2 + x2 = 0 + -0.2

Reorder the terms:
0.2 + -0.2 + 0.6x + x2 = 0 + -0.2

Combine like terms: 0.2 + -0.2 = 0.0
0.0 + 0.6x + x2 = 0 + -0.2
0.6x + x2 = 0 + -0.2

Combine like terms: 0 + -0.2 = -0.2
0.6x + x2 = -0.2

The x term is 0.6x.  Take half its coefficient (0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
0.6x + 0.09 + x2 = -0.2 + 0.09

Reorder the terms:
0.09 + 0.6x + x2 = -0.2 + 0.09

Combine like terms: -0.2 + 0.09 = -0.11
0.09 + 0.6x + x2 = -0.11

Factor a perfect square on the left side:
(x + 0.3)(x + 0.3) = -0.11

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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