3x^2-x=300

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Solution for 3x^2-x=300 equation:


Simplifying
3x2 + -1x = 300

Reorder the terms:
-1x + 3x2 = 300

Solving
-1x + 3x2 = 300

Solving for variable 'x'.

Reorder the terms:
-300 + -1x + 3x2 = 300 + -300

Combine like terms: 300 + -300 = 0
-300 + -1x + 3x2 = 0

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

Divide each side by '3'.
-100 + -0.3333333333x + x2 = 0

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + -0.3333333333x + 100 + x2 = 0 + 100

Reorder the terms:
-100 + 100 + -0.3333333333x + x2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + -0.3333333333x + x2 = 0 + 100
-0.3333333333x + x2 = 0 + 100

Combine like terms: 0 + 100 = 100
-0.3333333333x + x2 = 100

The x term is -0.3333333333x.  Take half its coefficient (-0.1666666667).
Square it (0.02777777779) and add it to both sides.

Add '0.02777777779' to each side of the equation.
-0.3333333333x + 0.02777777779 + x2 = 100 + 0.02777777779

Reorder the terms:
0.02777777779 + -0.3333333333x + x2 = 100 + 0.02777777779

Combine like terms: 100 + 0.02777777779 = 100.02777777779
0.02777777779 + -0.3333333333x + x2 = 100.02777777779

Factor a perfect square on the left side:
(x + -0.1666666667)(x + -0.1666666667) = 100.02777777779

Calculate the square root of the right side: 10.001388792

Break this problem into two subproblems by setting 
(x + -0.1666666667) equal to 10.001388792 and -10.001388792.

Subproblem 1

x + -0.1666666667 = 10.001388792 Simplifying x + -0.1666666667 = 10.001388792 Reorder the terms: -0.1666666667 + x = 10.001388792 Solving -0.1666666667 + x = 10.001388792 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1666666667' to each side of the equation. -0.1666666667 + 0.1666666667 + x = 10.001388792 + 0.1666666667 Combine like terms: -0.1666666667 + 0.1666666667 = 0.0000000000 0.0000000000 + x = 10.001388792 + 0.1666666667 x = 10.001388792 + 0.1666666667 Combine like terms: 10.001388792 + 0.1666666667 = 10.1680554587 x = 10.1680554587 Simplifying x = 10.1680554587

Subproblem 2

x + -0.1666666667 = -10.001388792 Simplifying x + -0.1666666667 = -10.001388792 Reorder the terms: -0.1666666667 + x = -10.001388792 Solving -0.1666666667 + x = -10.001388792 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1666666667' to each side of the equation. -0.1666666667 + 0.1666666667 + x = -10.001388792 + 0.1666666667 Combine like terms: -0.1666666667 + 0.1666666667 = 0.0000000000 0.0000000000 + x = -10.001388792 + 0.1666666667 x = -10.001388792 + 0.1666666667 Combine like terms: -10.001388792 + 0.1666666667 = -9.8347221253 x = -9.8347221253 Simplifying x = -9.8347221253

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.1680554587, -9.8347221253}

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