0=l^2+2l-64

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Solution for 0=l^2+2l-64 equation:


Simplifying
0 = l2 + 2l + -64

Reorder the terms:
0 = -64 + 2l + l2

Solving
0 = -64 + 2l + l2

Solving for variable 'l'.

Combine like terms: 0 + 64 = 64
64 + -2l + -1l2 = -64 + 2l + l2 + 64 + -2l + -1l2

Reorder the terms:
64 + -2l + -1l2 = -64 + 64 + 2l + -2l + l2 + -1l2

Combine like terms: -64 + 64 = 0
64 + -2l + -1l2 = 0 + 2l + -2l + l2 + -1l2
64 + -2l + -1l2 = 2l + -2l + l2 + -1l2

Combine like terms: 2l + -2l = 0
64 + -2l + -1l2 = 0 + l2 + -1l2
64 + -2l + -1l2 = l2 + -1l2

Combine like terms: l2 + -1l2 = 0
64 + -2l + -1l2 = 0

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

Divide each side by '-1'.
-64 + 2l + l2 = 0

Move the constant term to the right:

Add '64' to each side of the equation.
-64 + 2l + 64 + l2 = 0 + 64

Reorder the terms:
-64 + 64 + 2l + l2 = 0 + 64

Combine like terms: -64 + 64 = 0
0 + 2l + l2 = 0 + 64
2l + l2 = 0 + 64

Combine like terms: 0 + 64 = 64
2l + l2 = 64

The l term is 2l.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2l + 1 + l2 = 64 + 1

Reorder the terms:
1 + 2l + l2 = 64 + 1

Combine like terms: 64 + 1 = 65
1 + 2l + l2 = 65

Factor a perfect square on the left side:
(l + 1)(l + 1) = 65

Calculate the square root of the right side: 8.062257748

Break this problem into two subproblems by setting 
(l + 1) equal to 8.062257748 and -8.062257748.

Subproblem 1

l + 1 = 8.062257748 Simplifying l + 1 = 8.062257748 Reorder the terms: 1 + l = 8.062257748 Solving 1 + l = 8.062257748 Solving for variable 'l'. Move all terms containing l to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + l = 8.062257748 + -1 Combine like terms: 1 + -1 = 0 0 + l = 8.062257748 + -1 l = 8.062257748 + -1 Combine like terms: 8.062257748 + -1 = 7.062257748 l = 7.062257748 Simplifying l = 7.062257748

Subproblem 2

l + 1 = -8.062257748 Simplifying l + 1 = -8.062257748 Reorder the terms: 1 + l = -8.062257748 Solving 1 + l = -8.062257748 Solving for variable 'l'. Move all terms containing l to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + l = -8.062257748 + -1 Combine like terms: 1 + -1 = 0 0 + l = -8.062257748 + -1 l = -8.062257748 + -1 Combine like terms: -8.062257748 + -1 = -9.062257748 l = -9.062257748 Simplifying l = -9.062257748

Solution

The solution to the problem is based on the solutions from the subproblems. l = {7.062257748, -9.062257748}

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