3600=0.05x^2+2.0x

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Solution for 3600=0.05x^2+2.0x equation:


Simplifying
3600 = 0.05x2 + 2.0x

Reorder the terms:
3600 = 2.0x + 0.05x2

Solving
3600 = 2.0x + 0.05x2

Solving for variable 'x'.

Reorder the terms:
3600 + -2.0x + -0.05x2 = 2.0x + -2.0x + 0.05x2 + -0.05x2

Combine like terms: 2.0x + -2.0x = 0.0
3600 + -2.0x + -0.05x2 = 0.0 + 0.05x2 + -0.05x2
3600 + -2.0x + -0.05x2 = 0.05x2 + -0.05x2

Combine like terms: 0.05x2 + -0.05x2 = 0.00
3600 + -2.0x + -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'.
-72000 + 40x + x2 = 0

Move the constant term to the right:

Add '72000' to each side of the equation.
-72000 + 40x + 72000 + x2 = 0 + 72000

Reorder the terms:
-72000 + 72000 + 40x + x2 = 0 + 72000

Combine like terms: -72000 + 72000 = 0
0 + 40x + x2 = 0 + 72000
40x + x2 = 0 + 72000

Combine like terms: 0 + 72000 = 72000
40x + x2 = 72000

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 = 72000 + 400

Reorder the terms:
400 + 40x + x2 = 72000 + 400

Combine like terms: 72000 + 400 = 72400
400 + 40x + x2 = 72400

Factor a perfect square on the left side:
(x + 20)(x + 20) = 72400

Calculate the square root of the right side: 269.072480941

Break this problem into two subproblems by setting 
(x + 20) equal to 269.072480941 and -269.072480941.

Subproblem 1

x + 20 = 269.072480941 Simplifying x + 20 = 269.072480941 Reorder the terms: 20 + x = 269.072480941 Solving 20 + x = 269.072480941 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 = 269.072480941 + -20 Combine like terms: 20 + -20 = 0 0 + x = 269.072480941 + -20 x = 269.072480941 + -20 Combine like terms: 269.072480941 + -20 = 249.072480941 x = 249.072480941 Simplifying x = 249.072480941

Subproblem 2

x + 20 = -269.072480941 Simplifying x + 20 = -269.072480941 Reorder the terms: 20 + x = -269.072480941 Solving 20 + x = -269.072480941 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 = -269.072480941 + -20 Combine like terms: 20 + -20 = 0 0 + x = -269.072480941 + -20 x = -269.072480941 + -20 Combine like terms: -269.072480941 + -20 = -289.072480941 x = -289.072480941 Simplifying x = -289.072480941

Solution

The solution to the problem is based on the solutions from the subproblems. x = {249.072480941, -289.072480941}

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