y^2-40y+140=0

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Solution for y^2-40y+140=0 equation:


Simplifying
y2 + -40y + 140 = 0

Reorder the terms:
140 + -40y + y2 = 0

Solving
140 + -40y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '-140' to each side of the equation.
140 + -40y + -140 + y2 = 0 + -140

Reorder the terms:
140 + -140 + -40y + y2 = 0 + -140

Combine like terms: 140 + -140 = 0
0 + -40y + y2 = 0 + -140
-40y + y2 = 0 + -140

Combine like terms: 0 + -140 = -140
-40y + y2 = -140

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

Add '400' to each side of the equation.
-40y + 400 + y2 = -140 + 400

Reorder the terms:
400 + -40y + y2 = -140 + 400

Combine like terms: -140 + 400 = 260
400 + -40y + y2 = 260

Factor a perfect square on the left side:
(y + -20)(y + -20) = 260

Calculate the square root of the right side: 16.124515497

Break this problem into two subproblems by setting 
(y + -20) equal to 16.124515497 and -16.124515497.

Subproblem 1

y + -20 = 16.124515497 Simplifying y + -20 = 16.124515497 Reorder the terms: -20 + y = 16.124515497 Solving -20 + y = 16.124515497 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + y = 16.124515497 + 20 Combine like terms: -20 + 20 = 0 0 + y = 16.124515497 + 20 y = 16.124515497 + 20 Combine like terms: 16.124515497 + 20 = 36.124515497 y = 36.124515497 Simplifying y = 36.124515497

Subproblem 2

y + -20 = -16.124515497 Simplifying y + -20 = -16.124515497 Reorder the terms: -20 + y = -16.124515497 Solving -20 + y = -16.124515497 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + y = -16.124515497 + 20 Combine like terms: -20 + 20 = 0 0 + y = -16.124515497 + 20 y = -16.124515497 + 20 Combine like terms: -16.124515497 + 20 = 3.875484503 y = 3.875484503 Simplifying y = 3.875484503

Solution

The solution to the problem is based on the solutions from the subproblems. y = {36.124515497, 3.875484503}

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