4l^2-7l-130=0

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Solution for 4l^2-7l-130=0 equation:


Simplifying
4l2 + -7l + -130 = 0

Reorder the terms:
-130 + -7l + 4l2 = 0

Solving
-130 + -7l + 4l2 = 0

Solving for variable 'l'.

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

Divide each side by '4'.
-32.5 + -1.75l + l2 = 0

Move the constant term to the right:

Add '32.5' to each side of the equation.
-32.5 + -1.75l + 32.5 + l2 = 0 + 32.5

Reorder the terms:
-32.5 + 32.5 + -1.75l + l2 = 0 + 32.5

Combine like terms: -32.5 + 32.5 = 0.0
0.0 + -1.75l + l2 = 0 + 32.5
-1.75l + l2 = 0 + 32.5

Combine like terms: 0 + 32.5 = 32.5
-1.75l + l2 = 32.5

The l term is -1.75l.  Take half its coefficient (-0.875).
Square it (0.765625) and add it to both sides.

Add '0.765625' to each side of the equation.
-1.75l + 0.765625 + l2 = 32.5 + 0.765625

Reorder the terms:
0.765625 + -1.75l + l2 = 32.5 + 0.765625

Combine like terms: 32.5 + 0.765625 = 33.265625
0.765625 + -1.75l + l2 = 33.265625

Factor a perfect square on the left side:
(l + -0.875)(l + -0.875) = 33.265625

Calculate the square root of the right side: 5.767635998

Break this problem into two subproblems by setting 
(l + -0.875) equal to 5.767635998 and -5.767635998.

Subproblem 1

l + -0.875 = 5.767635998 Simplifying l + -0.875 = 5.767635998 Reorder the terms: -0.875 + l = 5.767635998 Solving -0.875 + l = 5.767635998 Solving for variable 'l'. Move all terms containing l to the left, all other terms to the right. Add '0.875' to each side of the equation. -0.875 + 0.875 + l = 5.767635998 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + l = 5.767635998 + 0.875 l = 5.767635998 + 0.875 Combine like terms: 5.767635998 + 0.875 = 6.642635998 l = 6.642635998 Simplifying l = 6.642635998

Subproblem 2

l + -0.875 = -5.767635998 Simplifying l + -0.875 = -5.767635998 Reorder the terms: -0.875 + l = -5.767635998 Solving -0.875 + l = -5.767635998 Solving for variable 'l'. Move all terms containing l to the left, all other terms to the right. Add '0.875' to each side of the equation. -0.875 + 0.875 + l = -5.767635998 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + l = -5.767635998 + 0.875 l = -5.767635998 + 0.875 Combine like terms: -5.767635998 + 0.875 = -4.892635998 l = -4.892635998 Simplifying l = -4.892635998

Solution

The solution to the problem is based on the solutions from the subproblems. l = {6.642635998, -4.892635998}

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