1.5x^2+60x-1800=0

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Solution for 1.5x^2+60x-1800=0 equation:


Simplifying
1.5x2 + 60x + -1800 = 0

Reorder the terms:
-1800 + 60x + 1.5x2 = 0

Solving
-1800 + 60x + 1.5x2 = 0

Solving for variable 'x'.

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

Divide each side by '1.5'.
-1200 + 40x + x2 = 0

Move the constant term to the right:

Add '1200' to each side of the equation.
-1200 + 40x + 1200 + x2 = 0 + 1200

Reorder the terms:
-1200 + 1200 + 40x + x2 = 0 + 1200

Combine like terms: -1200 + 1200 = 0
0 + 40x + x2 = 0 + 1200
40x + x2 = 0 + 1200

Combine like terms: 0 + 1200 = 1200
40x + x2 = 1200

The x term is 40x.  Take half its coefficient (20).
Square it (400) and add it to both sides.

Add '400' to each side of the equation.
40x + 400 + x2 = 1200 + 400

Reorder the terms:
400 + 40x + x2 = 1200 + 400

Combine like terms: 1200 + 400 = 1600
400 + 40x + x2 = 1600

Factor a perfect square on the left side:
(x + 20)(x + 20) = 1600

Calculate the square root of the right side: 40

Break this problem into two subproblems by setting 
(x + 20) equal to 40 and -40.

Subproblem 1

x + 20 = 40 Simplifying x + 20 = 40 Reorder the terms: 20 + x = 40 Solving 20 + x = 40 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + x = 40 + -20 Combine like terms: 20 + -20 = 0 0 + x = 40 + -20 x = 40 + -20 Combine like terms: 40 + -20 = 20 x = 20 Simplifying x = 20

Subproblem 2

x + 20 = -40 Simplifying x + 20 = -40 Reorder the terms: 20 + x = -40 Solving 20 + x = -40 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + x = -40 + -20 Combine like terms: 20 + -20 = 0 0 + x = -40 + -20 x = -40 + -20 Combine like terms: -40 + -20 = -60 x = -60 Simplifying x = -60

Solution

The solution to the problem is based on the solutions from the subproblems. x = {20, -60}

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