0=-(0.05)*x^2+x+40

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Solution for 0=-(0.05)*x^2+x+40 equation:


Simplifying
0 = -1(0.05) * x2 + x + 40

Multiply -1 * 0.05
0 = -0.05x2 + x + 40

Reorder the terms:
0 = 40 + x + -0.05x2

Solving
0 = 40 + x + -0.05x2

Solving for variable 'x'.

Combine like terms: 0 + -40 = -40
-40 + -1x + 0.05x2 = 40 + x + -0.05x2 + -40 + -1x + 0.05x2

Reorder the terms:
-40 + -1x + 0.05x2 = 40 + -40 + x + -1x + -0.05x2 + 0.05x2

Combine like terms: 40 + -40 = 0
-40 + -1x + 0.05x2 = 0 + x + -1x + -0.05x2 + 0.05x2
-40 + -1x + 0.05x2 = x + -1x + -0.05x2 + 0.05x2

Combine like terms: x + -1x = 0
-40 + -1x + 0.05x2 = 0 + -0.05x2 + 0.05x2
-40 + -1x + 0.05x2 = -0.05x2 + 0.05x2

Combine like terms: -0.05x2 + 0.05x2 = 0.00
-40 + -1x + 0.05x2 = 0.00

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

Divide each side by '0.05'.
-800 + -20x + x2 = 0

Move the constant term to the right:

Add '800' to each side of the equation.
-800 + -20x + 800 + x2 = 0 + 800

Reorder the terms:
-800 + 800 + -20x + x2 = 0 + 800

Combine like terms: -800 + 800 = 0
0 + -20x + x2 = 0 + 800
-20x + x2 = 0 + 800

Combine like terms: 0 + 800 = 800
-20x + x2 = 800

The x term is -20x.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20x + 100 + x2 = 800 + 100

Reorder the terms:
100 + -20x + x2 = 800 + 100

Combine like terms: 800 + 100 = 900
100 + -20x + x2 = 900

Factor a perfect square on the left side:
(x + -10)(x + -10) = 900

Calculate the square root of the right side: 30

Break this problem into two subproblems by setting 
(x + -10) equal to 30 and -30.

Subproblem 1

x + -10 = 30 Simplifying x + -10 = 30 Reorder the terms: -10 + x = 30 Solving -10 + x = 30 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = 30 + 10 Combine like terms: -10 + 10 = 0 0 + x = 30 + 10 x = 30 + 10 Combine like terms: 30 + 10 = 40 x = 40 Simplifying x = 40

Subproblem 2

x + -10 = -30 Simplifying x + -10 = -30 Reorder the terms: -10 + x = -30 Solving -10 + x = -30 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = -30 + 10 Combine like terms: -10 + 10 = 0 0 + x = -30 + 10 x = -30 + 10 Combine like terms: -30 + 10 = -20 x = -20 Simplifying x = -20

Solution

The solution to the problem is based on the solutions from the subproblems. x = {40, -20}

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