0.04x^2-3.5x+100=40

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Solution for 0.04x^2-3.5x+100=40 equation:


Simplifying
0.04x2 + -3.5x + 100 = 40

Reorder the terms:
100 + -3.5x + 0.04x2 = 40

Solving
100 + -3.5x + 0.04x2 = 40

Solving for variable 'x'.

Reorder the terms:
100 + -40 + -3.5x + 0.04x2 = 40 + -40

Combine like terms: 100 + -40 = 60
60 + -3.5x + 0.04x2 = 40 + -40

Combine like terms: 40 + -40 = 0
60 + -3.5x + 0.04x2 = 0

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

Divide each side by '0.04'.
1500 + -87.5x + x2 = 0

Move the constant term to the right:

Add '-1500' to each side of the equation.
1500 + -87.5x + -1500 + x2 = 0 + -1500

Reorder the terms:
1500 + -1500 + -87.5x + x2 = 0 + -1500

Combine like terms: 1500 + -1500 = 0
0 + -87.5x + x2 = 0 + -1500
-87.5x + x2 = 0 + -1500

Combine like terms: 0 + -1500 = -1500
-87.5x + x2 = -1500

The x term is -87.5x.  Take half its coefficient (-43.75).
Square it (1914.0625) and add it to both sides.

Add '1914.0625' to each side of the equation.
-87.5x + 1914.0625 + x2 = -1500 + 1914.0625

Reorder the terms:
1914.0625 + -87.5x + x2 = -1500 + 1914.0625

Combine like terms: -1500 + 1914.0625 = 414.0625
1914.0625 + -87.5x + x2 = 414.0625

Factor a perfect square on the left side:
(x + -43.75)(x + -43.75) = 414.0625

Calculate the square root of the right side: 20.348525745

Break this problem into two subproblems by setting 
(x + -43.75) equal to 20.348525745 and -20.348525745.

Subproblem 1

x + -43.75 = 20.348525745 Simplifying x + -43.75 = 20.348525745 Reorder the terms: -43.75 + x = 20.348525745 Solving -43.75 + x = 20.348525745 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '43.75' to each side of the equation. -43.75 + 43.75 + x = 20.348525745 + 43.75 Combine like terms: -43.75 + 43.75 = 0.00 0.00 + x = 20.348525745 + 43.75 x = 20.348525745 + 43.75 Combine like terms: 20.348525745 + 43.75 = 64.098525745 x = 64.098525745 Simplifying x = 64.098525745

Subproblem 2

x + -43.75 = -20.348525745 Simplifying x + -43.75 = -20.348525745 Reorder the terms: -43.75 + x = -20.348525745 Solving -43.75 + x = -20.348525745 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '43.75' to each side of the equation. -43.75 + 43.75 + x = -20.348525745 + 43.75 Combine like terms: -43.75 + 43.75 = 0.00 0.00 + x = -20.348525745 + 43.75 x = -20.348525745 + 43.75 Combine like terms: -20.348525745 + 43.75 = 23.401474255 x = 23.401474255 Simplifying x = 23.401474255

Solution

The solution to the problem is based on the solutions from the subproblems. x = {64.098525745, 23.401474255}

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