0.3x^2+3x-180=0

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Solution for 0.3x^2+3x-180=0 equation:


Simplifying
0.3x2 + 3x + -180 = 0

Reorder the terms:
-180 + 3x + 0.3x2 = 0

Solving
-180 + 3x + 0.3x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.3'.
-600 + 10x + x2 = 0

Move the constant term to the right:

Add '600' to each side of the equation.
-600 + 10x + 600 + x2 = 0 + 600

Reorder the terms:
-600 + 600 + 10x + x2 = 0 + 600

Combine like terms: -600 + 600 = 0
0 + 10x + x2 = 0 + 600
10x + x2 = 0 + 600

Combine like terms: 0 + 600 = 600
10x + x2 = 600

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 = 600 + 25

Reorder the terms:
25 + 10x + x2 = 600 + 25

Combine like terms: 600 + 25 = 625
25 + 10x + x2 = 625

Factor a perfect square on the left side:
(x + 5)(x + 5) = 625

Calculate the square root of the right side: 25

Break this problem into two subproblems by setting 
(x + 5) equal to 25 and -25.

Subproblem 1

x + 5 = 25 Simplifying x + 5 = 25 Reorder the terms: 5 + x = 25 Solving 5 + x = 25 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 = 25 + -5 Combine like terms: 5 + -5 = 0 0 + x = 25 + -5 x = 25 + -5 Combine like terms: 25 + -5 = 20 x = 20 Simplifying x = 20

Subproblem 2

x + 5 = -25 Simplifying x + 5 = -25 Reorder the terms: 5 + x = -25 Solving 5 + x = -25 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 = -25 + -5 Combine like terms: 5 + -5 = 0 0 + x = -25 + -5 x = -25 + -5 Combine like terms: -25 + -5 = -30 x = -30 Simplifying x = -30

Solution

The solution to the problem is based on the solutions from the subproblems. x = {20, -30}

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