Expand the expression $8\left(n^2+3\right)$8(n2+3) and simplify where necessary.

Expand the expression $5\left(9+w^2\right)$5(9+w2) and simplify where necessary.

Expand the expression $\left(y^3-3\right)\times4$(y3−3)×4 and simplify where necessary.

Expand the expression $-3\left(s^2+6\right)$−3(s2+6) and simplify where necessary.