l^2+4l=10

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Solution for l^2+4l=10 equation: 


Simplifying
l2 + 4l = 10

Reorder the terms:
4l + l2 = 10

Solving
4l + l2 = 10

Solving for variable 'l'.

Reorder the terms:
-10 + 4l + l2 = 10 + -10

Combine like terms: 10 + -10 = 0
-10 + 4l + l2 = 0

Begin completing the square.

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + 4l + 10 + l2 = 0 + 10

Reorder the terms:
-10 + 10 + 4l + l2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + 4l + l2 = 0 + 10
4l + l2 = 0 + 10

Combine like terms: 0 + 10 = 10
4l + l2 = 10

The l term is 4l.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4l + 4 + l2 = 10 + 4

Reorder the terms:
4 + 4l + l2 = 10 + 4

Combine like terms: 10 + 4 = 14
4 + 4l + l2 = 14

Factor a perfect square on the left side:
(l + 2)(l + 2) = 14

Calculate the square root of the right side: 3.741657387

Break this problem into two subproblems by setting 
(l + 2) equal to 3.741657387 and -3.741657387.


Subproblem 1
l + 2 = 3.741657387

Simplifying
l + 2 = 3.741657387

Reorder the terms:
2 + l = 3.741657387

Solving
2 + l = 3.741657387

Solving for variable 'l'.

Move all terms containing l to the left, all other terms to the right.

Add '-2' to each side of the equation.
2 + -2 + l = 3.741657387 + -2

Combine like terms: 2 + -2 = 0
0 + l = 3.741657387 + -2
l = 3.741657387 + -2

Combine like terms: 3.741657387 + -2 = 1.741657387
l = 1.741657387

Simplifying
l = 1.741657387


Subproblem 2
l + 2 = -3.741657387

Simplifying
l + 2 = -3.741657387

Reorder the terms:
2 + l = -3.741657387

Solving
2 + l = -3.741657387

Solving for variable 'l'.

Move all terms containing l to the left, all other terms to the right.

Add '-2' to each side of the equation.
2 + -2 + l = -3.741657387 + -2

Combine like terms: 2 + -2 = 0
0 + l = -3.741657387 + -2
l = -3.741657387 + -2

Combine like terms: -3.741657387 + -2 = -5.741657387
l = -5.741657387

Simplifying
l = -5.741657387


Solution
The solution to the problem is based on the solutions
from the subproblems.
l = {1.741657387, -5.741657387}

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