3000=L*(L-8)

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Solution for 3000=L*(L-8) equation:


Simplifying
3000 = L(L + -8)

Reorder the terms:
3000 = L(-8 + L)
3000 = (-8 * L + L * L)
3000 = (-8L + L2)

Solving
3000 = -8L + L2

Solving for variable 'L'.

Reorder the terms:
3000 + 8L + -1L2 = -8L + 8L + L2 + -1L2

Combine like terms: -8L + 8L = 0
3000 + 8L + -1L2 = 0 + L2 + -1L2
3000 + 8L + -1L2 = L2 + -1L2

Combine like terms: L2 + -1L2 = 0
3000 + 8L + -1L2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-3000 + -8L + L2 = 0

Move the constant term to the right:

Add '3000' to each side of the equation.
-3000 + -8L + 3000 + L2 = 0 + 3000

Reorder the terms:
-3000 + 3000 + -8L + L2 = 0 + 3000

Combine like terms: -3000 + 3000 = 0
0 + -8L + L2 = 0 + 3000
-8L + L2 = 0 + 3000

Combine like terms: 0 + 3000 = 3000
-8L + L2 = 3000

The L term is -8L.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8L + 16 + L2 = 3000 + 16

Reorder the terms:
16 + -8L + L2 = 3000 + 16

Combine like terms: 3000 + 16 = 3016
16 + -8L + L2 = 3016

Factor a perfect square on the left side:
(L + -4)(L + -4) = 3016

Calculate the square root of the right side: 54.918120871

Break this problem into two subproblems by setting 
(L + -4) equal to 54.918120871 and -54.918120871.

Subproblem 1

L + -4 = 54.918120871 Simplifying L + -4 = 54.918120871 Reorder the terms: -4 + L = 54.918120871 Solving -4 + L = 54.918120871 Solving for variable 'L'. Move all terms containing L to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + L = 54.918120871 + 4 Combine like terms: -4 + 4 = 0 0 + L = 54.918120871 + 4 L = 54.918120871 + 4 Combine like terms: 54.918120871 + 4 = 58.918120871 L = 58.918120871 Simplifying L = 58.918120871

Subproblem 2

L + -4 = -54.918120871 Simplifying L + -4 = -54.918120871 Reorder the terms: -4 + L = -54.918120871 Solving -4 + L = -54.918120871 Solving for variable 'L'. Move all terms containing L to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + L = -54.918120871 + 4 Combine like terms: -4 + 4 = 0 0 + L = -54.918120871 + 4 L = -54.918120871 + 4 Combine like terms: -54.918120871 + 4 = -50.918120871 L = -50.918120871 Simplifying L = -50.918120871

Solution

The solution to the problem is based on the solutions from the subproblems. L = {58.918120871, -50.918120871}

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