y^2-40y-3=0

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Solution for y^2-40y-3=0 equation:


Simplifying
y2 + -40y + -3 = 0

Reorder the terms:
-3 + -40y + y2 = 0

Solving
-3 + -40y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -40y + 3 + y2 = 0 + 3

Reorder the terms:
-3 + 3 + -40y + y2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -40y + y2 = 0 + 3
-40y + y2 = 0 + 3

Combine like terms: 0 + 3 = 3
-40y + y2 = 3

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 = 3 + 400

Reorder the terms:
400 + -40y + y2 = 3 + 400

Combine like terms: 3 + 400 = 403
400 + -40y + y2 = 403

Factor a perfect square on the left side:
(y + -20)(y + -20) = 403

Calculate the square root of the right side: 20.0748599

Break this problem into two subproblems by setting 
(y + -20) equal to 20.0748599 and -20.0748599.

Subproblem 1

y + -20 = 20.0748599 Simplifying y + -20 = 20.0748599 Reorder the terms: -20 + y = 20.0748599 Solving -20 + y = 20.0748599 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 = 20.0748599 + 20 Combine like terms: -20 + 20 = 0 0 + y = 20.0748599 + 20 y = 20.0748599 + 20 Combine like terms: 20.0748599 + 20 = 40.0748599 y = 40.0748599 Simplifying y = 40.0748599

Subproblem 2

y + -20 = -20.0748599 Simplifying y + -20 = -20.0748599 Reorder the terms: -20 + y = -20.0748599 Solving -20 + y = -20.0748599 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 = -20.0748599 + 20 Combine like terms: -20 + 20 = 0 0 + y = -20.0748599 + 20 y = -20.0748599 + 20 Combine like terms: -20.0748599 + 20 = -0.0748599 y = -0.0748599 Simplifying y = -0.0748599

Solution

The solution to the problem is based on the solutions from the subproblems. y = {40.0748599, -0.0748599}

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