Question

How many terms of AP:9,17,25,__&&& must be taken to give a sum of 636​

Answer 1

Step-by-step explanation:

By using the formula and quadratic polynomial

Answer 2

Step-by-step explanation

1ST term=9

last term=8n+1

4n²+5n-636=0

n=-5+/-✓25+10176/8

=-5+101/8

=96/8=12

so 12 terms