120=0.05x^2+22x

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Solution for 120=0.05x^2+22x equation:


Simplifying
120 = 0.05x2 + 22x

Reorder the terms:
120 = 22x + 0.05x2

Solving
120 = 22x + 0.05x2

Solving for variable 'x'.

Reorder the terms:
120 + -22x + -0.05x2 = 22x + -22x + 0.05x2 + -0.05x2

Combine like terms: 22x + -22x = 0
120 + -22x + -0.05x2 = 0 + 0.05x2 + -0.05x2
120 + -22x + -0.05x2 = 0.05x2 + -0.05x2

Combine like terms: 0.05x2 + -0.05x2 = 0.00
120 + -22x + -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'.
-2400 + 440x + x2 = 0

Move the constant term to the right:

Add '2400' to each side of the equation.
-2400 + 440x + 2400 + x2 = 0 + 2400

Reorder the terms:
-2400 + 2400 + 440x + x2 = 0 + 2400

Combine like terms: -2400 + 2400 = 0
0 + 440x + x2 = 0 + 2400
440x + x2 = 0 + 2400

Combine like terms: 0 + 2400 = 2400
440x + x2 = 2400

The x term is 440x.  Take half its coefficient (220).
Square it (48400) and add it to both sides.

Add '48400' to each side of the equation.
440x + 48400 + x2 = 2400 + 48400

Reorder the terms:
48400 + 440x + x2 = 2400 + 48400

Combine like terms: 2400 + 48400 = 50800
48400 + 440x + x2 = 50800

Factor a perfect square on the left side:
(x + 220)(x + 220) = 50800

Calculate the square root of the right side: 225.388553392

Break this problem into two subproblems by setting 
(x + 220) equal to 225.388553392 and -225.388553392.

Subproblem 1

x + 220 = 225.388553392 Simplifying x + 220 = 225.388553392 Reorder the terms: 220 + x = 225.388553392 Solving 220 + x = 225.388553392 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-220' to each side of the equation. 220 + -220 + x = 225.388553392 + -220 Combine like terms: 220 + -220 = 0 0 + x = 225.388553392 + -220 x = 225.388553392 + -220 Combine like terms: 225.388553392 + -220 = 5.388553392 x = 5.388553392 Simplifying x = 5.388553392

Subproblem 2

x + 220 = -225.388553392 Simplifying x + 220 = -225.388553392 Reorder the terms: 220 + x = -225.388553392 Solving 220 + x = -225.388553392 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-220' to each side of the equation. 220 + -220 + x = -225.388553392 + -220 Combine like terms: 220 + -220 = 0 0 + x = -225.388553392 + -220 x = -225.388553392 + -220 Combine like terms: -225.388553392 + -220 = -445.388553392 x = -445.388553392 Simplifying x = -445.388553392

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.388553392, -445.388553392}

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