2(2k^2+81)-k=

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Solution for 2(2k^2+81)-k= equation:


Simplifying
2(2k2 + 81) + -1k = 0

Reorder the terms:
2(81 + 2k2) + -1k = 0
(81 * 2 + 2k2 * 2) + -1k = 0
(162 + 4k2) + -1k = 0

Reorder the terms:
162 + -1k + 4k2 = 0

Solving
162 + -1k + 4k2 = 0

Solving for variable 'k'.

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

Divide each side by '4'.
40.5 + -0.25k + k2 = 0

Move the constant term to the right:

Add '-40.5' to each side of the equation.
40.5 + -0.25k + -40.5 + k2 = 0 + -40.5

Reorder the terms:
40.5 + -40.5 + -0.25k + k2 = 0 + -40.5

Combine like terms: 40.5 + -40.5 = 0.0
0.0 + -0.25k + k2 = 0 + -40.5
-0.25k + k2 = 0 + -40.5

Combine like terms: 0 + -40.5 = -40.5
-0.25k + k2 = -40.5

The k term is -0.25k.  Take half its coefficient (-0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
-0.25k + 0.015625 + k2 = -40.5 + 0.015625

Reorder the terms:
0.015625 + -0.25k + k2 = -40.5 + 0.015625

Combine like terms: -40.5 + 0.015625 = -40.484375
0.015625 + -0.25k + k2 = -40.484375

Factor a perfect square on the left side:
(k + -0.125)(k + -0.125) = -40.484375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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