y^2-19y=4

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


Simplifying
y2 + -19y = 4

Reorder the terms:
-19y + y2 = 4

Solving
-19y + y2 = 4

Solving for variable 'y'.

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

Combine like terms: 4 + -4 = 0
-4 + -19y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -19y + 4 + y2 = 0 + 4

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

Combine like terms: -4 + 4 = 0
0 + -19y + y2 = 0 + 4
-19y + y2 = 0 + 4

Combine like terms: 0 + 4 = 4
-19y + y2 = 4

The y term is -19y.  Take half its coefficient (-9.5).
Square it (90.25) and add it to both sides.

Add '90.25' to each side of the equation.
-19y + 90.25 + y2 = 4 + 90.25

Reorder the terms:
90.25 + -19y + y2 = 4 + 90.25

Combine like terms: 4 + 90.25 = 94.25
90.25 + -19y + y2 = 94.25

Factor a perfect square on the left side:
(y + -9.5)(y + -9.5) = 94.25

Calculate the square root of the right side: 9.708243919

Break this problem into two subproblems by setting 
(y + -9.5) equal to 9.708243919 and -9.708243919.

Subproblem 1

y + -9.5 = 9.708243919 Simplifying y + -9.5 = 9.708243919 Reorder the terms: -9.5 + y = 9.708243919 Solving -9.5 + y = 9.708243919 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '9.5' to each side of the equation. -9.5 + 9.5 + y = 9.708243919 + 9.5 Combine like terms: -9.5 + 9.5 = 0.0 0.0 + y = 9.708243919 + 9.5 y = 9.708243919 + 9.5 Combine like terms: 9.708243919 + 9.5 = 19.208243919 y = 19.208243919 Simplifying y = 19.208243919

Subproblem 2

y + -9.5 = -9.708243919 Simplifying y + -9.5 = -9.708243919 Reorder the terms: -9.5 + y = -9.708243919 Solving -9.5 + y = -9.708243919 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '9.5' to each side of the equation. -9.5 + 9.5 + y = -9.708243919 + 9.5 Combine like terms: -9.5 + 9.5 = 0.0 0.0 + y = -9.708243919 + 9.5 y = -9.708243919 + 9.5 Combine like terms: -9.708243919 + 9.5 = -0.208243919 y = -0.208243919 Simplifying y = -0.208243919

Solution

The solution to the problem is based on the solutions from the subproblems. y = {19.208243919, -0.208243919}

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