y^2-18y-34=0

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Solution for y^2-18y-34=0 equation:


Simplifying
y2 + -18y + -34 = 0

Reorder the terms:
-34 + -18y + y2 = 0

Solving
-34 + -18y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '34' to each side of the equation.
-34 + -18y + 34 + y2 = 0 + 34

Reorder the terms:
-34 + 34 + -18y + y2 = 0 + 34

Combine like terms: -34 + 34 = 0
0 + -18y + y2 = 0 + 34
-18y + y2 = 0 + 34

Combine like terms: 0 + 34 = 34
-18y + y2 = 34

The y term is -18y.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18y + 81 + y2 = 34 + 81

Reorder the terms:
81 + -18y + y2 = 34 + 81

Combine like terms: 34 + 81 = 115
81 + -18y + y2 = 115

Factor a perfect square on the left side:
(y + -9)(y + -9) = 115

Calculate the square root of the right side: 10.723805295

Break this problem into two subproblems by setting 
(y + -9) equal to 10.723805295 and -10.723805295.

Subproblem 1

y + -9 = 10.723805295 Simplifying y + -9 = 10.723805295 Reorder the terms: -9 + y = 10.723805295 Solving -9 + y = 10.723805295 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + y = 10.723805295 + 9 Combine like terms: -9 + 9 = 0 0 + y = 10.723805295 + 9 y = 10.723805295 + 9 Combine like terms: 10.723805295 + 9 = 19.723805295 y = 19.723805295 Simplifying y = 19.723805295

Subproblem 2

y + -9 = -10.723805295 Simplifying y + -9 = -10.723805295 Reorder the terms: -9 + y = -10.723805295 Solving -9 + y = -10.723805295 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + y = -10.723805295 + 9 Combine like terms: -9 + 9 = 0 0 + y = -10.723805295 + 9 y = -10.723805295 + 9 Combine like terms: -10.723805295 + 9 = -1.723805295 y = -1.723805295 Simplifying y = -1.723805295

Solution

The solution to the problem is based on the solutions from the subproblems. y = {19.723805295, -1.723805295}

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