4=-0.0055x^2+1.15x+10

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Solution for 4=-0.0055x^2+1.15x+10 equation:


Simplifying
4 = -0.0055x2 + 1.15x + 10

Reorder the terms:
4 = 10 + 1.15x + -0.0055x2

Solving
4 = 10 + 1.15x + -0.0055x2

Solving for variable 'x'.

Combine like terms: 4 + -10 = -6
-6 + -1.15x + 0.0055x2 = 10 + 1.15x + -0.0055x2 + -10 + -1.15x + 0.0055x2

Reorder the terms:
-6 + -1.15x + 0.0055x2 = 10 + -10 + 1.15x + -1.15x + -0.0055x2 + 0.0055x2

Combine like terms: 10 + -10 = 0
-6 + -1.15x + 0.0055x2 = 0 + 1.15x + -1.15x + -0.0055x2 + 0.0055x2
-6 + -1.15x + 0.0055x2 = 1.15x + -1.15x + -0.0055x2 + 0.0055x2

Combine like terms: 1.15x + -1.15x = 0.00
-6 + -1.15x + 0.0055x2 = 0.00 + -0.0055x2 + 0.0055x2
-6 + -1.15x + 0.0055x2 = -0.0055x2 + 0.0055x2

Combine like terms: -0.0055x2 + 0.0055x2 = 0.0000
-6 + -1.15x + 0.0055x2 = 0.0000

Begin completing the square.  Divide all terms by
0.0055 the coefficient of the squared term: 

Divide each side by '0.0055'.
-1090.909091 + -209.0909091x + x2 = 0

Move the constant term to the right:

Add '1090.909091' to each side of the equation.
-1090.909091 + -209.0909091x + 1090.909091 + x2 = 0 + 1090.909091

Reorder the terms:
-1090.909091 + 1090.909091 + -209.0909091x + x2 = 0 + 1090.909091

Combine like terms: -1090.909091 + 1090.909091 = 0.000000
0.000000 + -209.0909091x + x2 = 0 + 1090.909091
-209.0909091x + x2 = 0 + 1090.909091

Combine like terms: 0 + 1090.909091 = 1090.909091
-209.0909091x + x2 = 1090.909091

The x term is -209.0909091x.  Take half its coefficient (-104.5454546).
Square it (10929.75208) and add it to both sides.

Add '10929.75208' to each side of the equation.
-209.0909091x + 10929.75208 + x2 = 1090.909091 + 10929.75208

Reorder the terms:
10929.75208 + -209.0909091x + x2 = 1090.909091 + 10929.75208

Combine like terms: 1090.909091 + 10929.75208 = 12020.661171
10929.75208 + -209.0909091x + x2 = 12020.661171

Factor a perfect square on the left side:
(x + -104.5454546)(x + -104.5454546) = 12020.661171

Calculate the square root of the right side: 109.638775855

Break this problem into two subproblems by setting 
(x + -104.5454546) equal to 109.638775855 and -109.638775855.

Subproblem 1

x + -104.5454546 = 109.638775855 Simplifying x + -104.5454546 = 109.638775855 Reorder the terms: -104.5454546 + x = 109.638775855 Solving -104.5454546 + x = 109.638775855 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '104.5454546' to each side of the equation. -104.5454546 + 104.5454546 + x = 109.638775855 + 104.5454546 Combine like terms: -104.5454546 + 104.5454546 = 0.0000000 0.0000000 + x = 109.638775855 + 104.5454546 x = 109.638775855 + 104.5454546 Combine like terms: 109.638775855 + 104.5454546 = 214.184230455 x = 214.184230455 Simplifying x = 214.184230455

Subproblem 2

x + -104.5454546 = -109.638775855 Simplifying x + -104.5454546 = -109.638775855 Reorder the terms: -104.5454546 + x = -109.638775855 Solving -104.5454546 + x = -109.638775855 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '104.5454546' to each side of the equation. -104.5454546 + 104.5454546 + x = -109.638775855 + 104.5454546 Combine like terms: -104.5454546 + 104.5454546 = 0.0000000 0.0000000 + x = -109.638775855 + 104.5454546 x = -109.638775855 + 104.5454546 Combine like terms: -109.638775855 + 104.5454546 = -5.093321255 x = -5.093321255 Simplifying x = -5.093321255

Solution

The solution to the problem is based on the solutions from the subproblems. x = {214.184230455, -5.093321255}

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