Question

how many terms of the ap 4+7+10+.........make the sum equal to 650​

Answer 1

Answer:

here

a=4

d=3

sn=650

Step-by-step explanation:

sn=n/2(2a+(n-1)d

sn=n/2(2×4+(n-1)3)

650/2=8n+3n^2-3n

325=5n+3n^2

3n^2+5n-325=0

SOLVE AFTER THIS..

Answer 2

a=4

d=3

Sn=650

Sn=n/2×(2a+(n-1)d)

650= n/2 ×( 2×4 + (n-1)3)

650=n/2 ×(8+3n-3)

650= n/2 ×( 5+3n)

650×2= n(5+3n)

1300=5n+3n^2

=3n^2 +5n - 1300

D = b^2 -4ac

= 25+15600

=15625

n= -b+- _/D÷2a

=-5+125÷6

120÷6

n=20

you might have problem in this method

but the answer is 100%true

sorry for hard method

thank you

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HAR HAR MAHADEV