0=l^2+25l-540

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Solution for 0=l^2+25l-540 equation:


Simplifying
0 = l2 + 25l + -540

Reorder the terms:
0 = -540 + 25l + l2

Solving
0 = -540 + 25l + l2

Solving for variable 'l'.

Combine like terms: 0 + 540 = 540
540 + -25l + -1l2 = -540 + 25l + l2 + 540 + -25l + -1l2

Reorder the terms:
540 + -25l + -1l2 = -540 + 540 + 25l + -25l + l2 + -1l2

Combine like terms: -540 + 540 = 0
540 + -25l + -1l2 = 0 + 25l + -25l + l2 + -1l2
540 + -25l + -1l2 = 25l + -25l + l2 + -1l2

Combine like terms: 25l + -25l = 0
540 + -25l + -1l2 = 0 + l2 + -1l2
540 + -25l + -1l2 = l2 + -1l2

Combine like terms: l2 + -1l2 = 0
540 + -25l + -1l2 = 0

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

Divide each side by '-1'.
-540 + 25l + l2 = 0

Move the constant term to the right:

Add '540' to each side of the equation.
-540 + 25l + 540 + l2 = 0 + 540

Reorder the terms:
-540 + 540 + 25l + l2 = 0 + 540

Combine like terms: -540 + 540 = 0
0 + 25l + l2 = 0 + 540
25l + l2 = 0 + 540

Combine like terms: 0 + 540 = 540
25l + l2 = 540

The l term is 25l.  Take half its coefficient (12.5).
Square it (156.25) and add it to both sides.

Add '156.25' to each side of the equation.
25l + 156.25 + l2 = 540 + 156.25

Reorder the terms:
156.25 + 25l + l2 = 540 + 156.25

Combine like terms: 540 + 156.25 = 696.25
156.25 + 25l + l2 = 696.25

Factor a perfect square on the left side:
(l + 12.5)(l + 12.5) = 696.25

Calculate the square root of the right side: 26.386549604

Break this problem into two subproblems by setting 
(l + 12.5) equal to 26.386549604 and -26.386549604.

Subproblem 1

l + 12.5 = 26.386549604 Simplifying l + 12.5 = 26.386549604 Reorder the terms: 12.5 + l = 26.386549604 Solving 12.5 + l = 26.386549604 Solving for variable 'l'. Move all terms containing l to the left, all other terms to the right. Add '-12.5' to each side of the equation. 12.5 + -12.5 + l = 26.386549604 + -12.5 Combine like terms: 12.5 + -12.5 = 0.0 0.0 + l = 26.386549604 + -12.5 l = 26.386549604 + -12.5 Combine like terms: 26.386549604 + -12.5 = 13.886549604 l = 13.886549604 Simplifying l = 13.886549604

Subproblem 2

l + 12.5 = -26.386549604 Simplifying l + 12.5 = -26.386549604 Reorder the terms: 12.5 + l = -26.386549604 Solving 12.5 + l = -26.386549604 Solving for variable 'l'. Move all terms containing l to the left, all other terms to the right. Add '-12.5' to each side of the equation. 12.5 + -12.5 + l = -26.386549604 + -12.5 Combine like terms: 12.5 + -12.5 = 0.0 0.0 + l = -26.386549604 + -12.5 l = -26.386549604 + -12.5 Combine like terms: -26.386549604 + -12.5 = -38.886549604 l = -38.886549604 Simplifying l = -38.886549604

Solution

The solution to the problem is based on the solutions from the subproblems. l = {13.886549604, -38.886549604}

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