Y^2-4y-21=0

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Solution for Y^2-4y-21=0 equation:


Simplifying
Y2 + -4y + -21 = 0

Reorder the terms:
-21 + Y2 + -4y = 0

Solving
-21 + Y2 + -4y = 0

Solving for variable 'Y'.

Move all terms containing Y to the left, all other terms to the right.

Add '21' to each side of the equation.
-21 + Y2 + 21 + -4y = 0 + 21

Reorder the terms:
-21 + 21 + Y2 + -4y = 0 + 21

Combine like terms: -21 + 21 = 0
0 + Y2 + -4y = 0 + 21
Y2 + -4y = 0 + 21

Combine like terms: 0 + 21 = 21
Y2 + -4y = 21

Add '4y' to each side of the equation.
Y2 + -4y + 4y = 21 + 4y

Combine like terms: -4y + 4y = 0
Y2 + 0 = 21 + 4y
Y2 = 21 + 4y

Simplifying
Y2 = 21 + 4y

Reorder the terms:
-21 + Y2 + -4y = 21 + 4y + -21 + -4y

Reorder the terms:
-21 + Y2 + -4y = 21 + -21 + 4y + -4y

Combine like terms: 21 + -21 = 0
-21 + Y2 + -4y = 0 + 4y + -4y
-21 + Y2 + -4y = 4y + -4y

Combine like terms: 4y + -4y = 0
-21 + Y2 + -4y = 0

The solution to this equation could not be determined.

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