SOLUTION: Help! Since the square of y is y^2 and the square of 13 is 169, why isn't the square of (y+13) equal to y^2 +169?

SOLUTION: Help! Since the square of y is y^2 and the square of 13 is 169, why isn't the square of (y+13) equal to y^2 +169?

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Question 871190: Help!
Since the square of y is y^2 and the square of 13 is 169, why isn't the square of (y+13) equal to y^2 +169?
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Because
or more simply using the distributive property,

So,

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