9x^2-24x-28=0

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Solution for 9x^2-24x-28=0 equation:


Simplifying
9x2 + -24x + -28 = 0

Reorder the terms:
-28 + -24x + 9x2 = 0

Solving
-28 + -24x + 9x2 = 0

Solving for variable 'x'.

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

Divide each side by '9'.
-3.111111111 + -2.666666667x + x2 = 0

Move the constant term to the right:

Add '3.111111111' to each side of the equation.
-3.111111111 + -2.666666667x + 3.111111111 + x2 = 0 + 3.111111111

Reorder the terms:
-3.111111111 + 3.111111111 + -2.666666667x + x2 = 0 + 3.111111111

Combine like terms: -3.111111111 + 3.111111111 = 0.000000000
0.000000000 + -2.666666667x + x2 = 0 + 3.111111111
-2.666666667x + x2 = 0 + 3.111111111

Combine like terms: 0 + 3.111111111 = 3.111111111
-2.666666667x + x2 = 3.111111111

The x term is -2.666666667x.  Take half its coefficient (-1.333333334).
Square it (1.777777780) and add it to both sides.

Add '1.777777780' to each side of the equation.
-2.666666667x + 1.777777780 + x2 = 3.111111111 + 1.777777780

Reorder the terms:
1.777777780 + -2.666666667x + x2 = 3.111111111 + 1.777777780

Combine like terms: 3.111111111 + 1.777777780 = 4.888888891
1.777777780 + -2.666666667x + x2 = 4.888888891

Factor a perfect square on the left side:
(x + -1.333333334)(x + -1.333333334) = 4.888888891

Calculate the square root of the right side: 2.211083194

Break this problem into two subproblems by setting 
(x + -1.333333334) equal to 2.211083194 and -2.211083194.

Subproblem 1

x + -1.333333334 = 2.211083194 Simplifying x + -1.333333334 = 2.211083194 Reorder the terms: -1.333333334 + x = 2.211083194 Solving -1.333333334 + x = 2.211083194 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.333333334' to each side of the equation. -1.333333334 + 1.333333334 + x = 2.211083194 + 1.333333334 Combine like terms: -1.333333334 + 1.333333334 = 0.000000000 0.000000000 + x = 2.211083194 + 1.333333334 x = 2.211083194 + 1.333333334 Combine like terms: 2.211083194 + 1.333333334 = 3.544416528 x = 3.544416528 Simplifying x = 3.544416528

Subproblem 2

x + -1.333333334 = -2.211083194 Simplifying x + -1.333333334 = -2.211083194 Reorder the terms: -1.333333334 + x = -2.211083194 Solving -1.333333334 + x = -2.211083194 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.333333334' to each side of the equation. -1.333333334 + 1.333333334 + x = -2.211083194 + 1.333333334 Combine like terms: -1.333333334 + 1.333333334 = 0.000000000 0.000000000 + x = -2.211083194 + 1.333333334 x = -2.211083194 + 1.333333334 Combine like terms: -2.211083194 + 1.333333334 = -0.87774986 x = -0.87774986 Simplifying x = -0.87774986

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.544416528, -0.87774986}

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