Question 808606
(3t-4)(t^2-5t+1)
Multiplying by 3t
3t(t^2 - 5t + 1)
= 3t^3 - 15t^2 + 3t
Multiplying by -4
-4(t^2 - 5t + 1)
-4t^2 + 20t - 4
collect like terms
3t^3 - 19t^2 -23t - 4.
Hope this helps.
:-)