-X*X+40X=20

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Solution for -X*X+40X=20 equation:


Simplifying
-1X * X + 40X = 20

Multiply X * X
-1X2 + 40X = 20

Reorder the terms:
40X + -1X2 = 20

Solving
40X + -1X2 = 20

Solving for variable 'X'.

Reorder the terms:
-20 + 40X + -1X2 = 20 + -20

Combine like terms: 20 + -20 = 0
-20 + 40X + -1X2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
20 + -40X + X2 = 0

Move the constant term to the right:

Add '-20' to each side of the equation.
20 + -40X + -20 + X2 = 0 + -20

Reorder the terms:
20 + -20 + -40X + X2 = 0 + -20

Combine like terms: 20 + -20 = 0
0 + -40X + X2 = 0 + -20
-40X + X2 = 0 + -20

Combine like terms: 0 + -20 = -20
-40X + X2 = -20

The X term is -40X.  Take half its coefficient (-20).
Square it (400) and add it to both sides.

Add '400' to each side of the equation.
-40X + 400 + X2 = -20 + 400

Reorder the terms:
400 + -40X + X2 = -20 + 400

Combine like terms: -20 + 400 = 380
400 + -40X + X2 = 380

Factor a perfect square on the left side:
(X + -20)(X + -20) = 380

Calculate the square root of the right side: 19.49358869

Break this problem into two subproblems by setting 
(X + -20) equal to 19.49358869 and -19.49358869.

Subproblem 1

X + -20 = 19.49358869 Simplifying X + -20 = 19.49358869 Reorder the terms: -20 + X = 19.49358869 Solving -20 + X = 19.49358869 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + X = 19.49358869 + 20 Combine like terms: -20 + 20 = 0 0 + X = 19.49358869 + 20 X = 19.49358869 + 20 Combine like terms: 19.49358869 + 20 = 39.49358869 X = 39.49358869 Simplifying X = 39.49358869

Subproblem 2

X + -20 = -19.49358869 Simplifying X + -20 = -19.49358869 Reorder the terms: -20 + X = -19.49358869 Solving -20 + X = -19.49358869 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + X = -19.49358869 + 20 Combine like terms: -20 + 20 = 0 0 + X = -19.49358869 + 20 X = -19.49358869 + 20 Combine like terms: -19.49358869 + 20 = 0.50641131 X = 0.50641131 Simplifying X = 0.50641131

Solution

The solution to the problem is based on the solutions from the subproblems. X = {39.49358869, 0.50641131}

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