3x^2+20x-60=0

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Solution for 3x^2+20x-60=0 equation:


Simplifying
3x2 + 20x + -60 = 0

Reorder the terms:
-60 + 20x + 3x2 = 0

Solving
-60 + 20x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
-20 + 6.666666667x + x2 = 0

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + 6.666666667x + 20 + x2 = 0 + 20

Reorder the terms:
-20 + 20 + 6.666666667x + x2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + 6.666666667x + x2 = 0 + 20
6.666666667x + x2 = 0 + 20

Combine like terms: 0 + 20 = 20
6.666666667x + x2 = 20

The x term is 6.666666667x.  Take half its coefficient (3.333333334).
Square it (11.11111112) and add it to both sides.

Add '11.11111112' to each side of the equation.
6.666666667x + 11.11111112 + x2 = 20 + 11.11111112

Reorder the terms:
11.11111112 + 6.666666667x + x2 = 20 + 11.11111112

Combine like terms: 20 + 11.11111112 = 31.11111112
11.11111112 + 6.666666667x + x2 = 31.11111112

Factor a perfect square on the left side:
(x + 3.333333334)(x + 3.333333334) = 31.11111112

Calculate the square root of the right side: 5.577733511

Break this problem into two subproblems by setting 
(x + 3.333333334) equal to 5.577733511 and -5.577733511.

Subproblem 1

x + 3.333333334 = 5.577733511 Simplifying x + 3.333333334 = 5.577733511 Reorder the terms: 3.333333334 + x = 5.577733511 Solving 3.333333334 + x = 5.577733511 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.333333334' to each side of the equation. 3.333333334 + -3.333333334 + x = 5.577733511 + -3.333333334 Combine like terms: 3.333333334 + -3.333333334 = 0.000000000 0.000000000 + x = 5.577733511 + -3.333333334 x = 5.577733511 + -3.333333334 Combine like terms: 5.577733511 + -3.333333334 = 2.244400177 x = 2.244400177 Simplifying x = 2.244400177

Subproblem 2

x + 3.333333334 = -5.577733511 Simplifying x + 3.333333334 = -5.577733511 Reorder the terms: 3.333333334 + x = -5.577733511 Solving 3.333333334 + x = -5.577733511 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.333333334' to each side of the equation. 3.333333334 + -3.333333334 + x = -5.577733511 + -3.333333334 Combine like terms: 3.333333334 + -3.333333334 = 0.000000000 0.000000000 + x = -5.577733511 + -3.333333334 x = -5.577733511 + -3.333333334 Combine like terms: -5.577733511 + -3.333333334 = -8.911066845 x = -8.911066845 Simplifying x = -8.911066845

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.244400177, -8.911066845}

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