3 x y x y = 3y2
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The prime factors of a squared number are the prime factors, if any, of its square root.
A prime number is a positive integer with two factors: one and the number itself. A squared number is any integer multiplied by itself. With the exception of 1, all squared numbers are composite.
91 is neither a prime nor a squared number. It is a composite having the prime factors 7 x 13.
(3x + 3y)(x + y) = 3(x + y)2
y2-3y=0 y(y-3) y=0,3