(7v^2+2v+4)+(v^2+6v+5)=0

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Solution for (7v^2+2v+4)+(v^2+6v+5)=0 equation:


Simplifying
(7v2 + 2v + 4) + (v2 + 6v + 5) = 0

Reorder the terms:
(4 + 2v + 7v2) + (v2 + 6v + 5) = 0

Remove parenthesis around (4 + 2v + 7v2)
4 + 2v + 7v2 + (v2 + 6v + 5) = 0

Reorder the terms:
4 + 2v + 7v2 + (5 + 6v + v2) = 0

Remove parenthesis around (5 + 6v + v2)
4 + 2v + 7v2 + 5 + 6v + v2 = 0

Reorder the terms:
4 + 5 + 2v + 6v + 7v2 + v2 = 0

Combine like terms: 4 + 5 = 9
9 + 2v + 6v + 7v2 + v2 = 0

Combine like terms: 2v + 6v = 8v
9 + 8v + 7v2 + v2 = 0

Combine like terms: 7v2 + v2 = 8v2
9 + 8v + 8v2 = 0

Solving
9 + 8v + 8v2 = 0

Solving for variable 'v'.

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

Divide each side by '8'.
1.125 + v + v2 = 0

Move the constant term to the right:

Add '-1.125' to each side of the equation.
1.125 + v + -1.125 + v2 = 0 + -1.125

Reorder the terms:
1.125 + -1.125 + v + v2 = 0 + -1.125

Combine like terms: 1.125 + -1.125 = 0.000
0.000 + v + v2 = 0 + -1.125
v + v2 = 0 + -1.125

Combine like terms: 0 + -1.125 = -1.125
v + v2 = -1.125

The v term is v.  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 + v2 = -1.125 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + v2 = -1.125 + 0.25

Combine like terms: -1.125 + 0.25 = -0.875
1.25 + v2 = -0.875

Factor a perfect square on the left side:
(v + 0.5)(v + 0.5) = -0.875

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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