10k^2=7k+18

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Solution for 10k^2=7k+18 equation:


Simplifying
10k2 = 7k + 18

Reorder the terms:
10k2 = 18 + 7k

Solving
10k2 = 18 + 7k

Solving for variable 'k'.

Reorder the terms:
-18 + -7k + 10k2 = 18 + 7k + -18 + -7k

Reorder the terms:
-18 + -7k + 10k2 = 18 + -18 + 7k + -7k

Combine like terms: 18 + -18 = 0
-18 + -7k + 10k2 = 0 + 7k + -7k
-18 + -7k + 10k2 = 7k + -7k

Combine like terms: 7k + -7k = 0
-18 + -7k + 10k2 = 0

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

Divide each side by '10'.
-1.8 + -0.7k + k2 = 0

Move the constant term to the right:

Add '1.8' to each side of the equation.
-1.8 + -0.7k + 1.8 + k2 = 0 + 1.8

Reorder the terms:
-1.8 + 1.8 + -0.7k + k2 = 0 + 1.8

Combine like terms: -1.8 + 1.8 = 0.0
0.0 + -0.7k + k2 = 0 + 1.8
-0.7k + k2 = 0 + 1.8

Combine like terms: 0 + 1.8 = 1.8
-0.7k + k2 = 1.8

The k term is -0.7k.  Take half its coefficient (-0.35).
Square it (0.1225) and add it to both sides.

Add '0.1225' to each side of the equation.
-0.7k + 0.1225 + k2 = 1.8 + 0.1225

Reorder the terms:
0.1225 + -0.7k + k2 = 1.8 + 0.1225

Combine like terms: 1.8 + 0.1225 = 1.9225
0.1225 + -0.7k + k2 = 1.9225

Factor a perfect square on the left side:
(k + -0.35)(k + -0.35) = 1.9225

Calculate the square root of the right side: 1.386542462

Break this problem into two subproblems by setting 
(k + -0.35) equal to 1.386542462 and -1.386542462.

Subproblem 1

k + -0.35 = 1.386542462 Simplifying k + -0.35 = 1.386542462 Reorder the terms: -0.35 + k = 1.386542462 Solving -0.35 + k = 1.386542462 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '0.35' to each side of the equation. -0.35 + 0.35 + k = 1.386542462 + 0.35 Combine like terms: -0.35 + 0.35 = 0.00 0.00 + k = 1.386542462 + 0.35 k = 1.386542462 + 0.35 Combine like terms: 1.386542462 + 0.35 = 1.736542462 k = 1.736542462 Simplifying k = 1.736542462

Subproblem 2

k + -0.35 = -1.386542462 Simplifying k + -0.35 = -1.386542462 Reorder the terms: -0.35 + k = -1.386542462 Solving -0.35 + k = -1.386542462 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '0.35' to each side of the equation. -0.35 + 0.35 + k = -1.386542462 + 0.35 Combine like terms: -0.35 + 0.35 = 0.00 0.00 + k = -1.386542462 + 0.35 k = -1.386542462 + 0.35 Combine like terms: -1.386542462 + 0.35 = -1.036542462 k = -1.036542462 Simplifying k = -1.036542462

Solution

The solution to the problem is based on the solutions from the subproblems. k = {1.736542462, -1.036542462}

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