7 times 7 times a times x times x = 49ax2
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The prime factors of a squared number are the prime factors, if any, of its square root.
prime factors =2^2 x 7 x 29(2^2 = 2 squared)
91 is neither a prime nor a squared number. It is a composite having the prime factors 7 x 13.
You don't! There are no common factors.
(5y - 6)(5y + 6)