42+36L-6L^2=94.5

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Solution for 42+36L-6L^2=94.5 equation:


Simplifying
42 + 36L + -6L2 = 94.5

Solving
42 + 36L + -6L2 = 94.5

Solving for variable 'L'.

Reorder the terms:
42 + -94.5 + 36L + -6L2 = 94.5 + -94.5

Combine like terms: 42 + -94.5 = -52.5
-52.5 + 36L + -6L2 = 94.5 + -94.5

Combine like terms: 94.5 + -94.5 = 0.0
-52.5 + 36L + -6L2 = 0.0

Begin completing the square.  Divide all terms by
-6 the coefficient of the squared term: 

Divide each side by '-6'.
8.75 + -6L + L2 = 0.0

Move the constant term to the right:

Add '-8.75' to each side of the equation.
8.75 + -6L + -8.75 + L2 = 0.0 + -8.75

Reorder the terms:
8.75 + -8.75 + -6L + L2 = 0.0 + -8.75

Combine like terms: 8.75 + -8.75 = 0.00
0.00 + -6L + L2 = 0.0 + -8.75
-6L + L2 = 0.0 + -8.75

Combine like terms: 0.0 + -8.75 = -8.75
-6L + L2 = -8.75

The L term is -6L.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6L + 9 + L2 = -8.75 + 9

Reorder the terms:
9 + -6L + L2 = -8.75 + 9

Combine like terms: -8.75 + 9 = 0.25
9 + -6L + L2 = 0.25

Factor a perfect square on the left side:
(L + -3)(L + -3) = 0.25

Calculate the square root of the right side: 0.5

Break this problem into two subproblems by setting 
(L + -3) equal to 0.5 and -0.5.

Subproblem 1

L + -3 = 0.5 Simplifying L + -3 = 0.5 Reorder the terms: -3 + L = 0.5 Solving -3 + L = 0.5 Solving for variable 'L'. Move all terms containing L to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + L = 0.5 + 3 Combine like terms: -3 + 3 = 0 0 + L = 0.5 + 3 L = 0.5 + 3 Combine like terms: 0.5 + 3 = 3.5 L = 3.5 Simplifying L = 3.5

Subproblem 2

L + -3 = -0.5 Simplifying L + -3 = -0.5 Reorder the terms: -3 + L = -0.5 Solving -3 + L = -0.5 Solving for variable 'L'. Move all terms containing L to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + L = -0.5 + 3 Combine like terms: -3 + 3 = 0 0 + L = -0.5 + 3 L = -0.5 + 3 Combine like terms: -0.5 + 3 = 2.5 L = 2.5 Simplifying L = 2.5

Solution

The solution to the problem is based on the solutions from the subproblems. L = {3.5, 2.5}

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