16k^2-5k-10=0

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Solution for 16k^2-5k-10=0 equation:


Simplifying
16k2 + -5k + -10 = 0

Reorder the terms:
-10 + -5k + 16k2 = 0

Solving
-10 + -5k + 16k2 = 0

Solving for variable 'k'.

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

Divide each side by '16'.
-0.625 + -0.3125k + k2 = 0

Move the constant term to the right:

Add '0.625' to each side of the equation.
-0.625 + -0.3125k + 0.625 + k2 = 0 + 0.625

Reorder the terms:
-0.625 + 0.625 + -0.3125k + k2 = 0 + 0.625

Combine like terms: -0.625 + 0.625 = 0.000
0.000 + -0.3125k + k2 = 0 + 0.625
-0.3125k + k2 = 0 + 0.625

Combine like terms: 0 + 0.625 = 0.625
-0.3125k + k2 = 0.625

The k term is -0.3125k.  Take half its coefficient (-0.15625).
Square it (0.0244140625) and add it to both sides.

Add '0.0244140625' to each side of the equation.
-0.3125k + 0.0244140625 + k2 = 0.625 + 0.0244140625

Reorder the terms:
0.0244140625 + -0.3125k + k2 = 0.625 + 0.0244140625

Combine like terms: 0.625 + 0.0244140625 = 0.6494140625
0.0244140625 + -0.3125k + k2 = 0.6494140625

Factor a perfect square on the left side:
(k + -0.15625)(k + -0.15625) = 0.6494140625

Calculate the square root of the right side: 0.80586231

Break this problem into two subproblems by setting 
(k + -0.15625) equal to 0.80586231 and -0.80586231.

Subproblem 1

k + -0.15625 = 0.80586231 Simplifying k + -0.15625 = 0.80586231 Reorder the terms: -0.15625 + k = 0.80586231 Solving -0.15625 + k = 0.80586231 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '0.15625' to each side of the equation. -0.15625 + 0.15625 + k = 0.80586231 + 0.15625 Combine like terms: -0.15625 + 0.15625 = 0.00000 0.00000 + k = 0.80586231 + 0.15625 k = 0.80586231 + 0.15625 Combine like terms: 0.80586231 + 0.15625 = 0.96211231 k = 0.96211231 Simplifying k = 0.96211231

Subproblem 2

k + -0.15625 = -0.80586231 Simplifying k + -0.15625 = -0.80586231 Reorder the terms: -0.15625 + k = -0.80586231 Solving -0.15625 + k = -0.80586231 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '0.15625' to each side of the equation. -0.15625 + 0.15625 + k = -0.80586231 + 0.15625 Combine like terms: -0.15625 + 0.15625 = 0.00000 0.00000 + k = -0.80586231 + 0.15625 k = -0.80586231 + 0.15625 Combine like terms: -0.80586231 + 0.15625 = -0.64961231 k = -0.64961231 Simplifying k = -0.64961231

Solution

The solution to the problem is based on the solutions from the subproblems. k = {0.96211231, -0.64961231}

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