3x^2-x=45

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Solution for 3x^2-x=45 equation:


Simplifying
3x2 + -1x = 45

Reorder the terms:
-1x + 3x2 = 45

Solving
-1x + 3x2 = 45

Solving for variable 'x'.

Reorder the terms:
-45 + -1x + 3x2 = 45 + -45

Combine like terms: 45 + -45 = 0
-45 + -1x + 3x2 = 0

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

Divide each side by '3'.
-15 + -0.3333333333x + x2 = 0

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + -0.3333333333x + 15 + x2 = 0 + 15

Reorder the terms:
-15 + 15 + -0.3333333333x + x2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + -0.3333333333x + x2 = 0 + 15
-0.3333333333x + x2 = 0 + 15

Combine like terms: 0 + 15 = 15
-0.3333333333x + x2 = 15

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 = 15 + 0.02777777779

Reorder the terms:
0.02777777779 + -0.3333333333x + x2 = 15 + 0.02777777779

Combine like terms: 15 + 0.02777777779 = 15.02777777779
0.02777777779 + -0.3333333333x + x2 = 15.02777777779

Factor a perfect square on the left side:
(x + -0.1666666667)(x + -0.1666666667) = 15.02777777779

Calculate the square root of the right side: 3.876567783

Break this problem into two subproblems by setting 
(x + -0.1666666667) equal to 3.876567783 and -3.876567783.

Subproblem 1

x + -0.1666666667 = 3.876567783 Simplifying x + -0.1666666667 = 3.876567783 Reorder the terms: -0.1666666667 + x = 3.876567783 Solving -0.1666666667 + x = 3.876567783 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 = 3.876567783 + 0.1666666667 Combine like terms: -0.1666666667 + 0.1666666667 = 0.0000000000 0.0000000000 + x = 3.876567783 + 0.1666666667 x = 3.876567783 + 0.1666666667 Combine like terms: 3.876567783 + 0.1666666667 = 4.0432344497 x = 4.0432344497 Simplifying x = 4.0432344497

Subproblem 2

x + -0.1666666667 = -3.876567783 Simplifying x + -0.1666666667 = -3.876567783 Reorder the terms: -0.1666666667 + x = -3.876567783 Solving -0.1666666667 + x = -3.876567783 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 = -3.876567783 + 0.1666666667 Combine like terms: -0.1666666667 + 0.1666666667 = 0.0000000000 0.0000000000 + x = -3.876567783 + 0.1666666667 x = -3.876567783 + 0.1666666667 Combine like terms: -3.876567783 + 0.1666666667 = -3.7099011163 x = -3.7099011163 Simplifying x = -3.7099011163

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.0432344497, -3.7099011163}

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