20x^2+33x-7=0

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


Simplifying
20x2 + 33x + -7 = 0

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

Solving
-7 + 33x + 20x2 = 0

Solving for variable 'x'.

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

Divide each side by '20'.
-0.35 + 1.65x + x2 = 0

Move the constant term to the right:

Add '0.35' to each side of the equation.
-0.35 + 1.65x + 0.35 + x2 = 0 + 0.35

Reorder the terms:
-0.35 + 0.35 + 1.65x + x2 = 0 + 0.35

Combine like terms: -0.35 + 0.35 = 0.00
0.00 + 1.65x + x2 = 0 + 0.35
1.65x + x2 = 0 + 0.35

Combine like terms: 0 + 0.35 = 0.35
1.65x + x2 = 0.35

The x term is 1.65x.  Take half its coefficient (0.825).
Square it (0.680625) and add it to both sides.

Add '0.680625' to each side of the equation.
1.65x + 0.680625 + x2 = 0.35 + 0.680625

Reorder the terms:
0.680625 + 1.65x + x2 = 0.35 + 0.680625

Combine like terms: 0.35 + 0.680625 = 1.030625
0.680625 + 1.65x + x2 = 1.030625

Factor a perfect square on the left side:
(x + 0.825)(x + 0.825) = 1.030625

Calculate the square root of the right side: 1.015197025

Break this problem into two subproblems by setting 
(x + 0.825) equal to 1.015197025 and -1.015197025.

Subproblem 1

x + 0.825 = 1.015197025 Simplifying x + 0.825 = 1.015197025 Reorder the terms: 0.825 + x = 1.015197025 Solving 0.825 + x = 1.015197025 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.825' to each side of the equation. 0.825 + -0.825 + x = 1.015197025 + -0.825 Combine like terms: 0.825 + -0.825 = 0.000 0.000 + x = 1.015197025 + -0.825 x = 1.015197025 + -0.825 Combine like terms: 1.015197025 + -0.825 = 0.190197025 x = 0.190197025 Simplifying x = 0.190197025

Subproblem 2

x + 0.825 = -1.015197025 Simplifying x + 0.825 = -1.015197025 Reorder the terms: 0.825 + x = -1.015197025 Solving 0.825 + x = -1.015197025 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.825' to each side of the equation. 0.825 + -0.825 + x = -1.015197025 + -0.825 Combine like terms: 0.825 + -0.825 = 0.000 0.000 + x = -1.015197025 + -0.825 x = -1.015197025 + -0.825 Combine like terms: -1.015197025 + -0.825 = -1.840197025 x = -1.840197025 Simplifying x = -1.840197025

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.190197025, -1.840197025}

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