81+y^2=y^2+8y+16

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Solution for 81+y^2=y^2+8y+16 equation:


Simplifying
81 + y2 = y2 + 8y + 16

Reorder the terms:
81 + y2 = 16 + 8y + y2

Add '-1y2' to each side of the equation.
81 + y2 + -1y2 = 16 + 8y + y2 + -1y2

Combine like terms: y2 + -1y2 = 0
81 + 0 = 16 + 8y + y2 + -1y2
81 = 16 + 8y + y2 + -1y2

Combine like terms: y2 + -1y2 = 0
81 = 16 + 8y + 0
81 = 16 + 8y

Solving
81 = 16 + 8y

Solving for variable 'y'.

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

Add '-8y' to each side of the equation.
81 + -8y = 16 + 8y + -8y

Combine like terms: 8y + -8y = 0
81 + -8y = 16 + 0
81 + -8y = 16

Add '-81' to each side of the equation.
81 + -81 + -8y = 16 + -81

Combine like terms: 81 + -81 = 0
0 + -8y = 16 + -81
-8y = 16 + -81

Combine like terms: 16 + -81 = -65
-8y = -65

Divide each side by '-8'.
y = 8.125

Simplifying
y = 8.125

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