40=.01x^2+.344x+28.74

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Solution for 40=.01x^2+.344x+28.74 equation:


Simplifying
40 = 0.01x2 + 0.344x + 28.74

Reorder the terms:
40 = 28.74 + 0.344x + 0.01x2

Solving
40 = 28.74 + 0.344x + 0.01x2

Solving for variable 'x'.

Combine like terms: 40 + -28.74 = 11.26
11.26 + -0.344x + -0.01x2 = 28.74 + 0.344x + 0.01x2 + -28.74 + -0.344x + -0.01x2

Reorder the terms:
11.26 + -0.344x + -0.01x2 = 28.74 + -28.74 + 0.344x + -0.344x + 0.01x2 + -0.01x2

Combine like terms: 28.74 + -28.74 = 0.00
11.26 + -0.344x + -0.01x2 = 0.00 + 0.344x + -0.344x + 0.01x2 + -0.01x2
11.26 + -0.344x + -0.01x2 = 0.344x + -0.344x + 0.01x2 + -0.01x2

Combine like terms: 0.344x + -0.344x = 0.000
11.26 + -0.344x + -0.01x2 = 0.000 + 0.01x2 + -0.01x2
11.26 + -0.344x + -0.01x2 = 0.01x2 + -0.01x2

Combine like terms: 0.01x2 + -0.01x2 = 0.00
11.26 + -0.344x + -0.01x2 = 0.00

Begin completing the square.  Divide all terms by
-0.01 the coefficient of the squared term: 

Divide each side by '-0.01'.
-1126 + 34.4x + x2 = 0

Move the constant term to the right:

Add '1126' to each side of the equation.
-1126 + 34.4x + 1126 + x2 = 0 + 1126

Reorder the terms:
-1126 + 1126 + 34.4x + x2 = 0 + 1126

Combine like terms: -1126 + 1126 = 0
0 + 34.4x + x2 = 0 + 1126
34.4x + x2 = 0 + 1126

Combine like terms: 0 + 1126 = 1126
34.4x + x2 = 1126

The x term is 34.4x.  Take half its coefficient (17.2).
Square it (295.84) and add it to both sides.

Add '295.84' to each side of the equation.
34.4x + 295.84 + x2 = 1126 + 295.84

Reorder the terms:
295.84 + 34.4x + x2 = 1126 + 295.84

Combine like terms: 1126 + 295.84 = 1421.84
295.84 + 34.4x + x2 = 1421.84

Factor a perfect square on the left side:
(x + 17.2)(x + 17.2) = 1421.84

Calculate the square root of the right side: 37.707293724

Break this problem into two subproblems by setting 
(x + 17.2) equal to 37.707293724 and -37.707293724.

Subproblem 1

x + 17.2 = 37.707293724 Simplifying x + 17.2 = 37.707293724 Reorder the terms: 17.2 + x = 37.707293724 Solving 17.2 + x = 37.707293724 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-17.2' to each side of the equation. 17.2 + -17.2 + x = 37.707293724 + -17.2 Combine like terms: 17.2 + -17.2 = 0.0 0.0 + x = 37.707293724 + -17.2 x = 37.707293724 + -17.2 Combine like terms: 37.707293724 + -17.2 = 20.507293724 x = 20.507293724 Simplifying x = 20.507293724

Subproblem 2

x + 17.2 = -37.707293724 Simplifying x + 17.2 = -37.707293724 Reorder the terms: 17.2 + x = -37.707293724 Solving 17.2 + x = -37.707293724 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-17.2' to each side of the equation. 17.2 + -17.2 + x = -37.707293724 + -17.2 Combine like terms: 17.2 + -17.2 = 0.0 0.0 + x = -37.707293724 + -17.2 x = -37.707293724 + -17.2 Combine like terms: -37.707293724 + -17.2 = -54.907293724 x = -54.907293724 Simplifying x = -54.907293724

Solution

The solution to the problem is based on the solutions from the subproblems. x = {20.507293724, -54.907293724}

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