Question

Plz answer these 2 questions fast
Plz plzz

Answer 1

Step-by-step explanation:

8) $5n^{2}-3n=n(5n-3)$

=>$\frac{2n(5n-3)}{2}=\frac{n}{2}(2*5n-6)$

This can be written in the form  $\frac{n}{2}(2a+(n-1)d)$

∴ a=5n and (n-1)d=(-6)

The rest u can do it

9) AP--->12, 16, 20, ..., 96

a=12 and l=96

Using formula $S=\frac{n}{2}(a+l)$, find the answer.

Thank u

Plzzz mark me as brainliest

Answer 2

refer above answer..........