120=0.05x^2+1.1x

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Solution for 120=0.05x^2+1.1x equation:


Simplifying
120 = 0.05x2 + 1.1x

Reorder the terms:
120 = 1.1x + 0.05x2

Solving
120 = 1.1x + 0.05x2

Solving for variable 'x'.

Reorder the terms:
120 + -1.1x + -0.05x2 = 1.1x + -1.1x + 0.05x2 + -0.05x2

Combine like terms: 1.1x + -1.1x = 0.0
120 + -1.1x + -0.05x2 = 0.0 + 0.05x2 + -0.05x2
120 + -1.1x + -0.05x2 = 0.05x2 + -0.05x2

Combine like terms: 0.05x2 + -0.05x2 = 0.00
120 + -1.1x + -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'.
-2400 + 22x + x2 = 0

Move the constant term to the right:

Add '2400' to each side of the equation.
-2400 + 22x + 2400 + x2 = 0 + 2400

Reorder the terms:
-2400 + 2400 + 22x + x2 = 0 + 2400

Combine like terms: -2400 + 2400 = 0
0 + 22x + x2 = 0 + 2400
22x + x2 = 0 + 2400

Combine like terms: 0 + 2400 = 2400
22x + x2 = 2400

The x term is 22x.  Take half its coefficient (11).
Square it (121) and add it to both sides.

Add '121' to each side of the equation.
22x + 121 + x2 = 2400 + 121

Reorder the terms:
121 + 22x + x2 = 2400 + 121

Combine like terms: 2400 + 121 = 2521
121 + 22x + x2 = 2521

Factor a perfect square on the left side:
(x + 11)(x + 11) = 2521

Calculate the square root of the right side: 50.209560843

Break this problem into two subproblems by setting 
(x + 11) equal to 50.209560843 and -50.209560843.

Subproblem 1

x + 11 = 50.209560843 Simplifying x + 11 = 50.209560843 Reorder the terms: 11 + x = 50.209560843 Solving 11 + x = 50.209560843 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + x = 50.209560843 + -11 Combine like terms: 11 + -11 = 0 0 + x = 50.209560843 + -11 x = 50.209560843 + -11 Combine like terms: 50.209560843 + -11 = 39.209560843 x = 39.209560843 Simplifying x = 39.209560843

Subproblem 2

x + 11 = -50.209560843 Simplifying x + 11 = -50.209560843 Reorder the terms: 11 + x = -50.209560843 Solving 11 + x = -50.209560843 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + x = -50.209560843 + -11 Combine like terms: 11 + -11 = 0 0 + x = -50.209560843 + -11 x = -50.209560843 + -11 Combine like terms: -50.209560843 + -11 = -61.209560843 x = -61.209560843 Simplifying x = -61.209560843

Solution

The solution to the problem is based on the solutions from the subproblems. x = {39.209560843, -61.209560843}

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