36=-5x^2+100x

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Solution for 36=-5x^2+100x equation:


Simplifying
36 = -5x2 + 100x

Reorder the terms:
36 = 100x + -5x2

Solving
36 = 100x + -5x2

Solving for variable 'x'.

Reorder the terms:
36 + -100x + 5x2 = 100x + -100x + -5x2 + 5x2

Combine like terms: 100x + -100x = 0
36 + -100x + 5x2 = 0 + -5x2 + 5x2
36 + -100x + 5x2 = -5x2 + 5x2

Combine like terms: -5x2 + 5x2 = 0
36 + -100x + 5x2 = 0

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

Divide each side by '5'.
7.2 + -20x + x2 = 0

Move the constant term to the right:

Add '-7.2' to each side of the equation.
7.2 + -20x + -7.2 + x2 = 0 + -7.2

Reorder the terms:
7.2 + -7.2 + -20x + x2 = 0 + -7.2

Combine like terms: 7.2 + -7.2 = 0.0
0.0 + -20x + x2 = 0 + -7.2
-20x + x2 = 0 + -7.2

Combine like terms: 0 + -7.2 = -7.2
-20x + x2 = -7.2

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 = -7.2 + 100

Reorder the terms:
100 + -20x + x2 = -7.2 + 100

Combine like terms: -7.2 + 100 = 92.8
100 + -20x + x2 = 92.8

Factor a perfect square on the left side:
(x + -10)(x + -10) = 92.8

Calculate the square root of the right side: 9.633275663

Break this problem into two subproblems by setting 
(x + -10) equal to 9.633275663 and -9.633275663.

Subproblem 1

x + -10 = 9.633275663 Simplifying x + -10 = 9.633275663 Reorder the terms: -10 + x = 9.633275663 Solving -10 + x = 9.633275663 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 = 9.633275663 + 10 Combine like terms: -10 + 10 = 0 0 + x = 9.633275663 + 10 x = 9.633275663 + 10 Combine like terms: 9.633275663 + 10 = 19.633275663 x = 19.633275663 Simplifying x = 19.633275663

Subproblem 2

x + -10 = -9.633275663 Simplifying x + -10 = -9.633275663 Reorder the terms: -10 + x = -9.633275663 Solving -10 + x = -9.633275663 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 = -9.633275663 + 10 Combine like terms: -10 + 10 = 0 0 + x = -9.633275663 + 10 x = -9.633275663 + 10 Combine like terms: -9.633275663 + 10 = 0.366724337 x = 0.366724337 Simplifying x = 0.366724337

Solution

The solution to the problem is based on the solutions from the subproblems. x = {19.633275663, 0.366724337}

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