y^2-16=y-2

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Solution for y^2-16=y-2 equation:


Simplifying
y2 + -16 = y + -2

Reorder the terms:
-16 + y2 = y + -2

Reorder the terms:
-16 + y2 = -2 + y

Solving
-16 + y2 = -2 + y

Solving for variable 'y'.

Reorder the terms:
-16 + 2 + -1y + y2 = -2 + y + 2 + -1y

Combine like terms: -16 + 2 = -14
-14 + -1y + y2 = -2 + y + 2 + -1y

Reorder the terms:
-14 + -1y + y2 = -2 + 2 + y + -1y

Combine like terms: -2 + 2 = 0
-14 + -1y + y2 = 0 + y + -1y
-14 + -1y + y2 = y + -1y

Combine like terms: y + -1y = 0
-14 + -1y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '14' to each side of the equation.
-14 + -1y + 14 + y2 = 0 + 14

Reorder the terms:
-14 + 14 + -1y + y2 = 0 + 14

Combine like terms: -14 + 14 = 0
0 + -1y + y2 = 0 + 14
-1y + y2 = 0 + 14

Combine like terms: 0 + 14 = 14
-1y + y2 = 14

The y term is -1y.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1y + 0.25 + y2 = 14 + 0.25

Reorder the terms:
0.25 + -1y + y2 = 14 + 0.25

Combine like terms: 14 + 0.25 = 14.25
0.25 + -1y + y2 = 14.25

Factor a perfect square on the left side:
(y + -0.5)(y + -0.5) = 14.25

Calculate the square root of the right side: 3.774917218

Break this problem into two subproblems by setting 
(y + -0.5) equal to 3.774917218 and -3.774917218.

Subproblem 1

y + -0.5 = 3.774917218 Simplifying y + -0.5 = 3.774917218 Reorder the terms: -0.5 + y = 3.774917218 Solving -0.5 + y = 3.774917218 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + y = 3.774917218 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + y = 3.774917218 + 0.5 y = 3.774917218 + 0.5 Combine like terms: 3.774917218 + 0.5 = 4.274917218 y = 4.274917218 Simplifying y = 4.274917218

Subproblem 2

y + -0.5 = -3.774917218 Simplifying y + -0.5 = -3.774917218 Reorder the terms: -0.5 + y = -3.774917218 Solving -0.5 + y = -3.774917218 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + y = -3.774917218 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + y = -3.774917218 + 0.5 y = -3.774917218 + 0.5 Combine like terms: -3.774917218 + 0.5 = -3.274917218 y = -3.274917218 Simplifying y = -3.274917218

Solution

The solution to the problem is based on the solutions from the subproblems. y = {4.274917218, -3.274917218}

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