Hi can someone help me with this question?.. I don't understand it what so ever

so a normal diff of squares is (a^2-b^2)factored it is(a+b)(a-b)and we know when exponents are multiplied together they’re added, so if you know that the b value is a square of a number, then look at the exponentlook at 1 y^4 is a square since y^2 x y^2 = y^4and 144 is the square of 12 both terms can be square rooted and there is a - sign, meaning a diff of squares:(y^2-12)(y^2+12) the second one is the only one that is not a difference of squaressorry i know i’m bad at explaining things