Question

write the coefficient of y^3 in (y-1) (2y^2-3)​

Answer 1

$(y - 1)(2 {y}^{2} - 3) \\ = 2 {y}^{3} - 3y - 2 {y}^{2} + 3 \\ = 2 {y}^{3} - 2 {y}^{2} - 3y + 3 \\ \\ the \: coeff \: of \: {y}^{3} \: is \: 2$

hope it helps