4x^2-33x-80=0

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Solution for 4x^2-33x-80=0 equation:


Simplifying
4x2 + -33x + -80 = 0

Reorder the terms:
-80 + -33x + 4x2 = 0

Solving
-80 + -33x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-20 + -8.25x + x2 = 0

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + -8.25x + 20 + x2 = 0 + 20

Reorder the terms:
-20 + 20 + -8.25x + x2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + -8.25x + x2 = 0 + 20
-8.25x + x2 = 0 + 20

Combine like terms: 0 + 20 = 20
-8.25x + x2 = 20

The x term is -8.25x.  Take half its coefficient (-4.125).
Square it (17.015625) and add it to both sides.

Add '17.015625' to each side of the equation.
-8.25x + 17.015625 + x2 = 20 + 17.015625

Reorder the terms:
17.015625 + -8.25x + x2 = 20 + 17.015625

Combine like terms: 20 + 17.015625 = 37.015625
17.015625 + -8.25x + x2 = 37.015625

Factor a perfect square on the left side:
(x + -4.125)(x + -4.125) = 37.015625

Calculate the square root of the right side: 6.084046762

Break this problem into two subproblems by setting 
(x + -4.125) equal to 6.084046762 and -6.084046762.

Subproblem 1

x + -4.125 = 6.084046762 Simplifying x + -4.125 = 6.084046762 Reorder the terms: -4.125 + x = 6.084046762 Solving -4.125 + x = 6.084046762 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.125' to each side of the equation. -4.125 + 4.125 + x = 6.084046762 + 4.125 Combine like terms: -4.125 + 4.125 = 0.000 0.000 + x = 6.084046762 + 4.125 x = 6.084046762 + 4.125 Combine like terms: 6.084046762 + 4.125 = 10.209046762 x = 10.209046762 Simplifying x = 10.209046762

Subproblem 2

x + -4.125 = -6.084046762 Simplifying x + -4.125 = -6.084046762 Reorder the terms: -4.125 + x = -6.084046762 Solving -4.125 + x = -6.084046762 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.125' to each side of the equation. -4.125 + 4.125 + x = -6.084046762 + 4.125 Combine like terms: -4.125 + 4.125 = 0.000 0.000 + x = -6.084046762 + 4.125 x = -6.084046762 + 4.125 Combine like terms: -6.084046762 + 4.125 = -1.959046762 x = -1.959046762 Simplifying x = -1.959046762

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.209046762, -1.959046762}

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