Kemal G. answered 05/11/17
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Hi GG,
(y-3)^2-49
(y-3)^2 - 7^2 (this is the difference of two squares and can be factored like this a^2 - b^2 = (a+b)(a-b))
(y-3+7)(y-3-7)
(y+4)(y-10)