3x^2=8-30x

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Solution for 3x^2=8-30x equation:


Simplifying
3x2 = 8 + -30x

Solving
3x2 = 8 + -30x

Solving for variable 'x'.

Reorder the terms:
-8 + 30x + 3x2 = 8 + -30x + -8 + 30x

Reorder the terms:
-8 + 30x + 3x2 = 8 + -8 + -30x + 30x

Combine like terms: 8 + -8 = 0
-8 + 30x + 3x2 = 0 + -30x + 30x
-8 + 30x + 3x2 = -30x + 30x

Combine like terms: -30x + 30x = 0
-8 + 30x + 3x2 = 0

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

Divide each side by '3'.
-2.666666667 + 10x + x2 = 0

Move the constant term to the right:

Add '2.666666667' to each side of the equation.
-2.666666667 + 10x + 2.666666667 + x2 = 0 + 2.666666667

Reorder the terms:
-2.666666667 + 2.666666667 + 10x + x2 = 0 + 2.666666667

Combine like terms: -2.666666667 + 2.666666667 = 0.000000000
0.000000000 + 10x + x2 = 0 + 2.666666667
10x + x2 = 0 + 2.666666667

Combine like terms: 0 + 2.666666667 = 2.666666667
10x + x2 = 2.666666667

The x term is 10x.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10x + 25 + x2 = 2.666666667 + 25

Reorder the terms:
25 + 10x + x2 = 2.666666667 + 25

Combine like terms: 2.666666667 + 25 = 27.666666667
25 + 10x + x2 = 27.666666667

Factor a perfect square on the left side:
(x + 5)(x + 5) = 27.666666667

Calculate the square root of the right side: 5.259911279

Break this problem into two subproblems by setting 
(x + 5) equal to 5.259911279 and -5.259911279.

Subproblem 1

x + 5 = 5.259911279 Simplifying x + 5 = 5.259911279 Reorder the terms: 5 + x = 5.259911279 Solving 5 + x = 5.259911279 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 5.259911279 + -5 Combine like terms: 5 + -5 = 0 0 + x = 5.259911279 + -5 x = 5.259911279 + -5 Combine like terms: 5.259911279 + -5 = 0.259911279 x = 0.259911279 Simplifying x = 0.259911279

Subproblem 2

x + 5 = -5.259911279 Simplifying x + 5 = -5.259911279 Reorder the terms: 5 + x = -5.259911279 Solving 5 + x = -5.259911279 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = -5.259911279 + -5 Combine like terms: 5 + -5 = 0 0 + x = -5.259911279 + -5 x = -5.259911279 + -5 Combine like terms: -5.259911279 + -5 = -10.259911279 x = -10.259911279 Simplifying x = -10.259911279

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.259911279, -10.259911279}

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