How do you factor (y^4-x^9) ?

you

So since you know that x^2-1 is equal to (x-1)(x+1),
you can figure that this factors to
(y^2-x^3)(y^2+x^3)
because you know how the difference of two squares formula, stated on the top line of this answer.

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14 estimated and 13.62 exacti’m pretty sure..