is 4y(squared)-17y+15 factorable?

Question

i think its just not factorable, but i'm not sure. thank you::)

Answer 1

let 4y^2 - 17y + 15 = 0
If the discriminant is a perfect square, then the quadratic will factor

b^2 - 4ac = 17^2 - 4(4)(15) = 49

yes it will factor.
(y-3)(4y - 5)

Answer 2

4x^3 + 8x^2y - 5xy^2