7x^2-33x-20=0

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Solution for 7x^2-33x-20=0 equation:


Simplifying
7x2 + -33x + -20 = 0

Reorder the terms:
-20 + -33x + 7x2 = 0

Solving
-20 + -33x + 7x2 = 0

Solving for variable 'x'.

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

Divide each side by '7'.
-2.857142857 + -4.714285714x + x2 = 0

Move the constant term to the right:

Add '2.857142857' to each side of the equation.
-2.857142857 + -4.714285714x + 2.857142857 + x2 = 0 + 2.857142857

Reorder the terms:
-2.857142857 + 2.857142857 + -4.714285714x + x2 = 0 + 2.857142857

Combine like terms: -2.857142857 + 2.857142857 = 0.000000000
0.000000000 + -4.714285714x + x2 = 0 + 2.857142857
-4.714285714x + x2 = 0 + 2.857142857

Combine like terms: 0 + 2.857142857 = 2.857142857
-4.714285714x + x2 = 2.857142857

The x term is -4.714285714x.  Take half its coefficient (-2.357142857).
Square it (5.556122448) and add it to both sides.

Add '5.556122448' to each side of the equation.
-4.714285714x + 5.556122448 + x2 = 2.857142857 + 5.556122448

Reorder the terms:
5.556122448 + -4.714285714x + x2 = 2.857142857 + 5.556122448

Combine like terms: 2.857142857 + 5.556122448 = 8.413265305
5.556122448 + -4.714285714x + x2 = 8.413265305

Factor a perfect square on the left side:
(x + -2.357142857)(x + -2.357142857) = 8.413265305

Calculate the square root of the right side: 2.900562929

Break this problem into two subproblems by setting 
(x + -2.357142857) equal to 2.900562929 and -2.900562929.

Subproblem 1

x + -2.357142857 = 2.900562929 Simplifying x + -2.357142857 = 2.900562929 Reorder the terms: -2.357142857 + x = 2.900562929 Solving -2.357142857 + x = 2.900562929 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.357142857' to each side of the equation. -2.357142857 + 2.357142857 + x = 2.900562929 + 2.357142857 Combine like terms: -2.357142857 + 2.357142857 = 0.000000000 0.000000000 + x = 2.900562929 + 2.357142857 x = 2.900562929 + 2.357142857 Combine like terms: 2.900562929 + 2.357142857 = 5.257705786 x = 5.257705786 Simplifying x = 5.257705786

Subproblem 2

x + -2.357142857 = -2.900562929 Simplifying x + -2.357142857 = -2.900562929 Reorder the terms: -2.357142857 + x = -2.900562929 Solving -2.357142857 + x = -2.900562929 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.357142857' to each side of the equation. -2.357142857 + 2.357142857 + x = -2.900562929 + 2.357142857 Combine like terms: -2.357142857 + 2.357142857 = 0.000000000 0.000000000 + x = -2.900562929 + 2.357142857 x = -2.900562929 + 2.357142857 Combine like terms: -2.900562929 + 2.357142857 = -0.543420072 x = -0.543420072 Simplifying x = -0.543420072

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.257705786, -0.543420072}

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