u^2-40u+3=0

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Solution for u^2-40u+3=0 equation:


Simplifying
u2 + -40u + 3 = 0

Reorder the terms:
3 + -40u + u2 = 0

Solving
3 + -40u + u2 = 0

Solving for variable 'u'.

Begin completing the square.

Move the constant term to the right:

Add '-3' to each side of the equation.
3 + -40u + -3 + u2 = 0 + -3

Reorder the terms:
3 + -3 + -40u + u2 = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -40u + u2 = 0 + -3
-40u + u2 = 0 + -3

Combine like terms: 0 + -3 = -3
-40u + u2 = -3

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

Add '400' to each side of the equation.
-40u + 400 + u2 = -3 + 400

Reorder the terms:
400 + -40u + u2 = -3 + 400

Combine like terms: -3 + 400 = 397
400 + -40u + u2 = 397

Factor a perfect square on the left side:
(u + -20)(u + -20) = 397

Calculate the square root of the right side: 19.924858845

Break this problem into two subproblems by setting 
(u + -20) equal to 19.924858845 and -19.924858845.

Subproblem 1

u + -20 = 19.924858845 Simplifying u + -20 = 19.924858845 Reorder the terms: -20 + u = 19.924858845 Solving -20 + u = 19.924858845 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + u = 19.924858845 + 20 Combine like terms: -20 + 20 = 0 0 + u = 19.924858845 + 20 u = 19.924858845 + 20 Combine like terms: 19.924858845 + 20 = 39.924858845 u = 39.924858845 Simplifying u = 39.924858845

Subproblem 2

u + -20 = -19.924858845 Simplifying u + -20 = -19.924858845 Reorder the terms: -20 + u = -19.924858845 Solving -20 + u = -19.924858845 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + u = -19.924858845 + 20 Combine like terms: -20 + 20 = 0 0 + u = -19.924858845 + 20 u = -19.924858845 + 20 Combine like terms: -19.924858845 + 20 = 0.075141155 u = 0.075141155 Simplifying u = 0.075141155

Solution

The solution to the problem is based on the solutions from the subproblems. u = {39.924858845, 0.075141155}

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