0=-.03x^2+1.8x-25

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Solution for 0=-.03x^2+1.8x-25 equation:


Simplifying
0 = -0.03x2 + 1.8x + -25

Reorder the terms:
0 = -25 + 1.8x + -0.03x2

Solving
0 = -25 + 1.8x + -0.03x2

Solving for variable 'x'.

Combine like terms: 0 + 25 = 25
25 + -1.8x + 0.03x2 = -25 + 1.8x + -0.03x2 + 25 + -1.8x + 0.03x2

Reorder the terms:
25 + -1.8x + 0.03x2 = -25 + 25 + 1.8x + -1.8x + -0.03x2 + 0.03x2

Combine like terms: -25 + 25 = 0
25 + -1.8x + 0.03x2 = 0 + 1.8x + -1.8x + -0.03x2 + 0.03x2
25 + -1.8x + 0.03x2 = 1.8x + -1.8x + -0.03x2 + 0.03x2

Combine like terms: 1.8x + -1.8x = 0.0
25 + -1.8x + 0.03x2 = 0.0 + -0.03x2 + 0.03x2
25 + -1.8x + 0.03x2 = -0.03x2 + 0.03x2

Combine like terms: -0.03x2 + 0.03x2 = 0.00
25 + -1.8x + 0.03x2 = 0.00

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

Divide each side by '0.03'.
833.3333333 + -60x + x2 = 0

Move the constant term to the right:

Add '-833.3333333' to each side of the equation.
833.3333333 + -60x + -833.3333333 + x2 = 0 + -833.3333333

Reorder the terms:
833.3333333 + -833.3333333 + -60x + x2 = 0 + -833.3333333

Combine like terms: 833.3333333 + -833.3333333 = 0.0000000
0.0000000 + -60x + x2 = 0 + -833.3333333
-60x + x2 = 0 + -833.3333333

Combine like terms: 0 + -833.3333333 = -833.3333333
-60x + x2 = -833.3333333

The x term is -60x.  Take half its coefficient (-30).
Square it (900) and add it to both sides.

Add '900' to each side of the equation.
-60x + 900 + x2 = -833.3333333 + 900

Reorder the terms:
900 + -60x + x2 = -833.3333333 + 900

Combine like terms: -833.3333333 + 900 = 66.6666667
900 + -60x + x2 = 66.6666667

Factor a perfect square on the left side:
(x + -30)(x + -30) = 66.6666667

Calculate the square root of the right side: 8.164965811

Break this problem into two subproblems by setting 
(x + -30) equal to 8.164965811 and -8.164965811.

Subproblem 1

x + -30 = 8.164965811 Simplifying x + -30 = 8.164965811 Reorder the terms: -30 + x = 8.164965811 Solving -30 + x = 8.164965811 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + x = 8.164965811 + 30 Combine like terms: -30 + 30 = 0 0 + x = 8.164965811 + 30 x = 8.164965811 + 30 Combine like terms: 8.164965811 + 30 = 38.164965811 x = 38.164965811 Simplifying x = 38.164965811

Subproblem 2

x + -30 = -8.164965811 Simplifying x + -30 = -8.164965811 Reorder the terms: -30 + x = -8.164965811 Solving -30 + x = -8.164965811 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + x = -8.164965811 + 30 Combine like terms: -30 + 30 = 0 0 + x = -8.164965811 + 30 x = -8.164965811 + 30 Combine like terms: -8.164965811 + 30 = 21.835034189 x = 21.835034189 Simplifying x = 21.835034189

Solution

The solution to the problem is based on the solutions from the subproblems. x = {38.164965811, 21.835034189}

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