l^2+2l+4=192

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Solution for l^2+2l+4=192 equation:


Simplifying
l2 + 2l + 4 = 192

Reorder the terms:
4 + 2l + l2 = 192

Solving
4 + 2l + l2 = 192

Solving for variable 'l'.

Reorder the terms:
4 + -192 + 2l + l2 = 192 + -192

Combine like terms: 4 + -192 = -188
-188 + 2l + l2 = 192 + -192

Combine like terms: 192 + -192 = 0
-188 + 2l + l2 = 0

Begin completing the square.

Move the constant term to the right:

Add '188' to each side of the equation.
-188 + 2l + 188 + l2 = 0 + 188

Reorder the terms:
-188 + 188 + 2l + l2 = 0 + 188

Combine like terms: -188 + 188 = 0
0 + 2l + l2 = 0 + 188
2l + l2 = 0 + 188

Combine like terms: 0 + 188 = 188
2l + l2 = 188

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 = 188 + 1

Reorder the terms:
1 + 2l + l2 = 188 + 1

Combine like terms: 188 + 1 = 189
1 + 2l + l2 = 189

Factor a perfect square on the left side:
(l + 1)(l + 1) = 189

Calculate the square root of the right side: 13.747727085

Break this problem into two subproblems by setting 
(l + 1) equal to 13.747727085 and -13.747727085.

Subproblem 1

l + 1 = 13.747727085 Simplifying l + 1 = 13.747727085 Reorder the terms: 1 + l = 13.747727085 Solving 1 + l = 13.747727085 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 = 13.747727085 + -1 Combine like terms: 1 + -1 = 0 0 + l = 13.747727085 + -1 l = 13.747727085 + -1 Combine like terms: 13.747727085 + -1 = 12.747727085 l = 12.747727085 Simplifying l = 12.747727085

Subproblem 2

l + 1 = -13.747727085 Simplifying l + 1 = -13.747727085 Reorder the terms: 1 + l = -13.747727085 Solving 1 + l = -13.747727085 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 = -13.747727085 + -1 Combine like terms: 1 + -1 = 0 0 + l = -13.747727085 + -1 l = -13.747727085 + -1 Combine like terms: -13.747727085 + -1 = -14.747727085 l = -14.747727085 Simplifying l = -14.747727085

Solution

The solution to the problem is based on the solutions from the subproblems. l = {12.747727085, -14.747727085}

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