2x^2-5x-33=21

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Solution for 2x^2-5x-33=21 equation:


Simplifying
2x2 + -5x + -33 = 21

Reorder the terms:
-33 + -5x + 2x2 = 21

Solving
-33 + -5x + 2x2 = 21

Solving for variable 'x'.

Reorder the terms:
-33 + -21 + -5x + 2x2 = 21 + -21

Combine like terms: -33 + -21 = -54
-54 + -5x + 2x2 = 21 + -21

Combine like terms: 21 + -21 = 0
-54 + -5x + 2x2 = 0

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

Divide each side by '2'.
-27 + -2.5x + x2 = 0

Move the constant term to the right:

Add '27' to each side of the equation.
-27 + -2.5x + 27 + x2 = 0 + 27

Reorder the terms:
-27 + 27 + -2.5x + x2 = 0 + 27

Combine like terms: -27 + 27 = 0
0 + -2.5x + x2 = 0 + 27
-2.5x + x2 = 0 + 27

Combine like terms: 0 + 27 = 27
-2.5x + x2 = 27

The x term is -2.5x.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5x + 1.5625 + x2 = 27 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = 27 + 1.5625

Combine like terms: 27 + 1.5625 = 28.5625
1.5625 + -2.5x + x2 = 28.5625

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = 28.5625

Calculate the square root of the right side: 5.344389582

Break this problem into two subproblems by setting 
(x + -1.25) equal to 5.344389582 and -5.344389582.

Subproblem 1

x + -1.25 = 5.344389582 Simplifying x + -1.25 = 5.344389582 Reorder the terms: -1.25 + x = 5.344389582 Solving -1.25 + x = 5.344389582 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = 5.344389582 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 5.344389582 + 1.25 x = 5.344389582 + 1.25 Combine like terms: 5.344389582 + 1.25 = 6.594389582 x = 6.594389582 Simplifying x = 6.594389582

Subproblem 2

x + -1.25 = -5.344389582 Simplifying x + -1.25 = -5.344389582 Reorder the terms: -1.25 + x = -5.344389582 Solving -1.25 + x = -5.344389582 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = -5.344389582 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = -5.344389582 + 1.25 x = -5.344389582 + 1.25 Combine like terms: -5.344389582 + 1.25 = -4.094389582 x = -4.094389582 Simplifying x = -4.094389582

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.594389582, -4.094389582}

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