(-7x^2-4x)+(x^2+8x-5)=

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Solution for (-7x^2-4x)+(x^2+8x-5)= equation: 


Simplifying
(-7x2 + -4x) + (x2 + 8x + -5) = 0

Reorder the terms:
(-4x + -7x2) + (x2 + 8x + -5) = 0

Remove parenthesis around (-4x + -7x2)
-4x + -7x2 + (x2 + 8x + -5) = 0

Reorder the terms:
-4x + -7x2 + (-5 + 8x + x2) = 0

Remove parenthesis around (-5 + 8x + x2)
-4x + -7x2 + -5 + 8x + x2 = 0

Reorder the terms:
-5 + -4x + 8x + -7x2 + x2 = 0

Combine like terms: -4x + 8x = 4x
-5 + 4x + -7x2 + x2 = 0

Combine like terms: -7x2 + x2 = -6x2
-5 + 4x + -6x2 = 0

Solving
-5 + 4x + -6x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-6 the coefficient of the squared term: 

Divide each side by '-6'.
0.8333333333 + -0.6666666667x + x2 = 0

Move the constant term to the right:

Add '-0.8333333333' to each side of the equation.
0.8333333333 + -0.6666666667x + -0.8333333333 + x2 = 0 + -0.8333333333

Reorder the terms:
0.8333333333 + -0.8333333333 + -0.6666666667x + x2 = 0 + -0.8333333333

Combine like terms: 0.8333333333 + -0.8333333333 = 0.0000000000
0.0000000000 + -0.6666666667x + x2 = 0 + -0.8333333333
-0.6666666667x + x2 = 0 + -0.8333333333

Combine like terms: 0 + -0.8333333333 = -0.8333333333
-0.6666666667x + x2 = -0.8333333333

The x term is -0.6666666667x.  Take half its coefficient (-0.3333333334).
Square it (0.1111111112) and add it to both sides.

Add '0.1111111112' to each side of the equation.
-0.6666666667x + 0.1111111112 + x2 = -0.8333333333 + 0.1111111112

Reorder the terms:
0.1111111112 + -0.6666666667x + x2 = -0.8333333333 + 0.1111111112

Combine like terms: -0.8333333333 + 0.1111111112 = -0.7222222221
0.1111111112 + -0.6666666667x + x2 = -0.7222222221

Factor a perfect square on the left side:
(x + -0.3333333334)(x + -0.3333333334) = -0.7222222221

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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