3x^2-24x=28

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Solution for 3x^2-24x=28 equation:


Simplifying
3x2 + -24x = 28

Reorder the terms:
-24x + 3x2 = 28

Solving
-24x + 3x2 = 28

Solving for variable 'x'.

Reorder the terms:
-28 + -24x + 3x2 = 28 + -28

Combine like terms: 28 + -28 = 0
-28 + -24x + 3x2 = 0

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

Divide each side by '3'.
-9.333333333 + -8x + x2 = 0

Move the constant term to the right:

Add '9.333333333' to each side of the equation.
-9.333333333 + -8x + 9.333333333 + x2 = 0 + 9.333333333

Reorder the terms:
-9.333333333 + 9.333333333 + -8x + x2 = 0 + 9.333333333

Combine like terms: -9.333333333 + 9.333333333 = 0.000000000
0.000000000 + -8x + x2 = 0 + 9.333333333
-8x + x2 = 0 + 9.333333333

Combine like terms: 0 + 9.333333333 = 9.333333333
-8x + x2 = 9.333333333

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = 9.333333333 + 16

Reorder the terms:
16 + -8x + x2 = 9.333333333 + 16

Combine like terms: 9.333333333 + 16 = 25.333333333
16 + -8x + x2 = 25.333333333

Factor a perfect square on the left side:
(x + -4)(x + -4) = 25.333333333

Calculate the square root of the right side: 5.033222957

Break this problem into two subproblems by setting 
(x + -4) equal to 5.033222957 and -5.033222957.

Subproblem 1

x + -4 = 5.033222957 Simplifying x + -4 = 5.033222957 Reorder the terms: -4 + x = 5.033222957 Solving -4 + x = 5.033222957 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 5.033222957 + 4 Combine like terms: -4 + 4 = 0 0 + x = 5.033222957 + 4 x = 5.033222957 + 4 Combine like terms: 5.033222957 + 4 = 9.033222957 x = 9.033222957 Simplifying x = 9.033222957

Subproblem 2

x + -4 = -5.033222957 Simplifying x + -4 = -5.033222957 Reorder the terms: -4 + x = -5.033222957 Solving -4 + x = -5.033222957 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -5.033222957 + 4 Combine like terms: -4 + 4 = 0 0 + x = -5.033222957 + 4 x = -5.033222957 + 4 Combine like terms: -5.033222957 + 4 = -1.033222957 x = -1.033222957 Simplifying x = -1.033222957

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.033222957, -1.033222957}

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