4c^2+21+c+5=

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Solution for 4c^2+21+c+5= equation:


Simplifying
4c2 + 21 + c + 5 = 0

Reorder the terms:
21 + 5 + c + 4c2 = 0

Combine like terms: 21 + 5 = 26
26 + c + 4c2 = 0

Solving
26 + c + 4c2 = 0

Solving for variable 'c'.

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

Divide each side by '4'.
6.5 + 0.25c + c2 = 0

Move the constant term to the right:

Add '-6.5' to each side of the equation.
6.5 + 0.25c + -6.5 + c2 = 0 + -6.5

Reorder the terms:
6.5 + -6.5 + 0.25c + c2 = 0 + -6.5

Combine like terms: 6.5 + -6.5 = 0.0
0.0 + 0.25c + c2 = 0 + -6.5
0.25c + c2 = 0 + -6.5

Combine like terms: 0 + -6.5 = -6.5
0.25c + c2 = -6.5

The c term is c.  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.
0.25c + 0.25 + c2 = -6.5 + 0.25

Reorder the terms:
0.25 + 0.25c + c2 = -6.5 + 0.25

Combine like terms: -6.5 + 0.25 = -6.25
0.25 + 0.25c + c2 = -6.25

Factor a perfect square on the left side:
(c + 0.5)(c + 0.5) = -6.25

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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