y^2-4y-63=0

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Solution for y^2-4y-63=0 equation:


Simplifying
y2 + -4y + -63 = 0

Reorder the terms:
-63 + -4y + y2 = 0

Solving
-63 + -4y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '63' to each side of the equation.
-63 + -4y + 63 + y2 = 0 + 63

Reorder the terms:
-63 + 63 + -4y + y2 = 0 + 63

Combine like terms: -63 + 63 = 0
0 + -4y + y2 = 0 + 63
-4y + y2 = 0 + 63

Combine like terms: 0 + 63 = 63
-4y + y2 = 63

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 = 63 + 4

Reorder the terms:
4 + -4y + y2 = 63 + 4

Combine like terms: 63 + 4 = 67
4 + -4y + y2 = 67

Factor a perfect square on the left side:
(y + -2)(y + -2) = 67

Calculate the square root of the right side: 8.185352772

Break this problem into two subproblems by setting 
(y + -2) equal to 8.185352772 and -8.185352772.

Subproblem 1

y + -2 = 8.185352772 Simplifying y + -2 = 8.185352772 Reorder the terms: -2 + y = 8.185352772 Solving -2 + y = 8.185352772 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 = 8.185352772 + 2 Combine like terms: -2 + 2 = 0 0 + y = 8.185352772 + 2 y = 8.185352772 + 2 Combine like terms: 8.185352772 + 2 = 10.185352772 y = 10.185352772 Simplifying y = 10.185352772

Subproblem 2

y + -2 = -8.185352772 Simplifying y + -2 = -8.185352772 Reorder the terms: -2 + y = -8.185352772 Solving -2 + y = -8.185352772 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 = -8.185352772 + 2 Combine like terms: -2 + 2 = 0 0 + y = -8.185352772 + 2 y = -8.185352772 + 2 Combine like terms: -8.185352772 + 2 = -6.185352772 y = -6.185352772 Simplifying y = -6.185352772

Solution

The solution to the problem is based on the solutions from the subproblems. y = {10.185352772, -6.185352772}

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