4y^2-16y-19=0

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Solution for 4y^2-16y-19=0 equation:


Simplifying
4y2 + -16y + -19 = 0

Reorder the terms:
-19 + -16y + 4y2 = 0

Solving
-19 + -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'.
-4.75 + -4y + y2 = 0

Move the constant term to the right:

Add '4.75' to each side of the equation.
-4.75 + -4y + 4.75 + y2 = 0 + 4.75

Reorder the terms:
-4.75 + 4.75 + -4y + y2 = 0 + 4.75

Combine like terms: -4.75 + 4.75 = 0.00
0.00 + -4y + y2 = 0 + 4.75
-4y + y2 = 0 + 4.75

Combine like terms: 0 + 4.75 = 4.75
-4y + y2 = 4.75

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 = 4.75 + 4

Reorder the terms:
4 + -4y + y2 = 4.75 + 4

Combine like terms: 4.75 + 4 = 8.75
4 + -4y + y2 = 8.75

Factor a perfect square on the left side:
(y + -2)(y + -2) = 8.75

Calculate the square root of the right side: 2.958039892

Break this problem into two subproblems by setting 
(y + -2) equal to 2.958039892 and -2.958039892.

Subproblem 1

y + -2 = 2.958039892 Simplifying y + -2 = 2.958039892 Reorder the terms: -2 + y = 2.958039892 Solving -2 + y = 2.958039892 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 = 2.958039892 + 2 Combine like terms: -2 + 2 = 0 0 + y = 2.958039892 + 2 y = 2.958039892 + 2 Combine like terms: 2.958039892 + 2 = 4.958039892 y = 4.958039892 Simplifying y = 4.958039892

Subproblem 2

y + -2 = -2.958039892 Simplifying y + -2 = -2.958039892 Reorder the terms: -2 + y = -2.958039892 Solving -2 + y = -2.958039892 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 = -2.958039892 + 2 Combine like terms: -2 + 2 = 0 0 + y = -2.958039892 + 2 y = -2.958039892 + 2 Combine like terms: -2.958039892 + 2 = -0.958039892 y = -0.958039892 Simplifying y = -0.958039892

Solution

The solution to the problem is based on the solutions from the subproblems. y = {4.958039892, -0.958039892}

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