-0.6l^2+36l=300

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Solution for -0.6l^2+36l=300 equation:


Simplifying
-0.6l2 + 36l = 300

Reorder the terms:
36l + -0.6l2 = 300

Solving
36l + -0.6l2 = 300

Solving for variable 'l'.

Reorder the terms:
-300 + 36l + -0.6l2 = 300 + -300

Combine like terms: 300 + -300 = 0
-300 + 36l + -0.6l2 = 0

Begin completing the square.  Divide all terms by
-0.6 the coefficient of the squared term: 

Divide each side by '-0.6'.
500 + -60l + l2 = 0

Move the constant term to the right:

Add '-500' to each side of the equation.
500 + -60l + -500 + l2 = 0 + -500

Reorder the terms:
500 + -500 + -60l + l2 = 0 + -500

Combine like terms: 500 + -500 = 0
0 + -60l + l2 = 0 + -500
-60l + l2 = 0 + -500

Combine like terms: 0 + -500 = -500
-60l + l2 = -500

The l term is -60l.  Take half its coefficient (-30).
Square it (900) and add it to both sides.

Add '900' to each side of the equation.
-60l + 900 + l2 = -500 + 900

Reorder the terms:
900 + -60l + l2 = -500 + 900

Combine like terms: -500 + 900 = 400
900 + -60l + l2 = 400

Factor a perfect square on the left side:
(l + -30)(l + -30) = 400

Calculate the square root of the right side: 20

Break this problem into two subproblems by setting 
(l + -30) equal to 20 and -20.

Subproblem 1

l + -30 = 20 Simplifying l + -30 = 20 Reorder the terms: -30 + l = 20 Solving -30 + l = 20 Solving for variable 'l'. Move all terms containing l to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + l = 20 + 30 Combine like terms: -30 + 30 = 0 0 + l = 20 + 30 l = 20 + 30 Combine like terms: 20 + 30 = 50 l = 50 Simplifying l = 50

Subproblem 2

l + -30 = -20 Simplifying l + -30 = -20 Reorder the terms: -30 + l = -20 Solving -30 + l = -20 Solving for variable 'l'. Move all terms containing l to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + l = -20 + 30 Combine like terms: -30 + 30 = 0 0 + l = -20 + 30 l = -20 + 30 Combine like terms: -20 + 30 = 10 l = 10 Simplifying l = 10

Solution

The solution to the problem is based on the solutions from the subproblems. l = {50, 10}

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