.04x^2-3.5x+100=60

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Solution for .04x^2-3.5x+100=60 equation:


Simplifying
0.04x2 + -3.5x + 100 = 60

Reorder the terms:
100 + -3.5x + 0.04x2 = 60

Solving
100 + -3.5x + 0.04x2 = 60

Solving for variable 'x'.

Reorder the terms:
100 + -60 + -3.5x + 0.04x2 = 60 + -60

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

Combine like terms: 60 + -60 = 0
40 + -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'.
1000 + -87.5x + x2 = 0

Move the constant term to the right:

Add '-1000' to each side of the equation.
1000 + -87.5x + -1000 + x2 = 0 + -1000

Reorder the terms:
1000 + -1000 + -87.5x + x2 = 0 + -1000

Combine like terms: 1000 + -1000 = 0
0 + -87.5x + x2 = 0 + -1000
-87.5x + x2 = 0 + -1000

Combine like terms: 0 + -1000 = -1000
-87.5x + x2 = -1000

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 = -1000 + 1914.0625

Reorder the terms:
1914.0625 + -87.5x + x2 = -1000 + 1914.0625

Combine like terms: -1000 + 1914.0625 = 914.0625
1914.0625 + -87.5x + x2 = 914.0625

Factor a perfect square on the left side:
(x + -43.75)(x + -43.75) = 914.0625

Calculate the square root of the right side: 30.233466556

Break this problem into two subproblems by setting 
(x + -43.75) equal to 30.233466556 and -30.233466556.

Subproblem 1

x + -43.75 = 30.233466556 Simplifying x + -43.75 = 30.233466556 Reorder the terms: -43.75 + x = 30.233466556 Solving -43.75 + x = 30.233466556 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 = 30.233466556 + 43.75 Combine like terms: -43.75 + 43.75 = 0.00 0.00 + x = 30.233466556 + 43.75 x = 30.233466556 + 43.75 Combine like terms: 30.233466556 + 43.75 = 73.983466556 x = 73.983466556 Simplifying x = 73.983466556

Subproblem 2

x + -43.75 = -30.233466556 Simplifying x + -43.75 = -30.233466556 Reorder the terms: -43.75 + x = -30.233466556 Solving -43.75 + x = -30.233466556 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 = -30.233466556 + 43.75 Combine like terms: -43.75 + 43.75 = 0.00 0.00 + x = -30.233466556 + 43.75 x = -30.233466556 + 43.75 Combine like terms: -30.233466556 + 43.75 = 13.516533444 x = 13.516533444 Simplifying x = 13.516533444

Solution

The solution to the problem is based on the solutions from the subproblems. x = {73.983466556, 13.516533444}

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