4y^2-16y-17=0

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Solution for 4y^2-16y-17=0 equation:


Simplifying
4y2 + -16y + -17 = 0

Reorder the terms:
-17 + -16y + 4y2 = 0

Solving
-17 + -16y + 4y2 = 0

Solving for variable 'y'.

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

Divide each side by '4'.
-4.25 + -4y + y2 = 0

Move the constant term to the right:

Add '4.25' to each side of the equation.
-4.25 + -4y + 4.25 + y2 = 0 + 4.25

Reorder the terms:
-4.25 + 4.25 + -4y + y2 = 0 + 4.25

Combine like terms: -4.25 + 4.25 = 0.00
0.00 + -4y + y2 = 0 + 4.25
-4y + y2 = 0 + 4.25

Combine like terms: 0 + 4.25 = 4.25
-4y + y2 = 4.25

The y term is -4y.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4y + 4 + y2 = 4.25 + 4

Reorder the terms:
4 + -4y + y2 = 4.25 + 4

Combine like terms: 4.25 + 4 = 8.25
4 + -4y + y2 = 8.25

Factor a perfect square on the left side:
(y + -2)(y + -2) = 8.25

Calculate the square root of the right side: 2.872281323

Break this problem into two subproblems by setting 
(y + -2) equal to 2.872281323 and -2.872281323.

Subproblem 1

y + -2 = 2.872281323 Simplifying y + -2 = 2.872281323 Reorder the terms: -2 + y = 2.872281323 Solving -2 + y = 2.872281323 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + y = 2.872281323 + 2 Combine like terms: -2 + 2 = 0 0 + y = 2.872281323 + 2 y = 2.872281323 + 2 Combine like terms: 2.872281323 + 2 = 4.872281323 y = 4.872281323 Simplifying y = 4.872281323

Subproblem 2

y + -2 = -2.872281323 Simplifying y + -2 = -2.872281323 Reorder the terms: -2 + y = -2.872281323 Solving -2 + y = -2.872281323 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + y = -2.872281323 + 2 Combine like terms: -2 + 2 = 0 0 + y = -2.872281323 + 2 y = -2.872281323 + 2 Combine like terms: -2.872281323 + 2 = -0.872281323 y = -0.872281323 Simplifying y = -0.872281323

Solution

The solution to the problem is based on the solutions from the subproblems. y = {4.872281323, -0.872281323}

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