Question

find d were a =-18 n=10 and an​

Answer 1

Answer:

d= 2

Step-by-step explanation:

Formula used :an = a+(n-1)d

Putting the values :

0= -18 + (10-1)d

= 18+ 10d-d = 0

-18+ 9d = 0

9d = 18

so d = 2

Answer 2

Answer:

$\sf\small{ \underline{\underline{ \pmb{Given:-}}}}$

• a = -18
• n = 10
• an = 0

$\sf\small{ \underline{\underline{ \pmb{To \: find:-}}}}$

• d (common difference)

$\sf\small{ \underline{\underline{ \pmb{Solution:-}}}}$

• Formula
• $\underline{\boxed{ \red{\sf \: a_n=a+(n-1) }}} \pink \bigstar$

$\sf \implies \: 0 = ( - 18) + (10 - 1)d$

$\sf \implies 0 = - 18 + 9d$

$\sf \implies 9d = 18$

$\sf \implies d = \cancel \frac{18}{9}$

$\sf \implies d = 2$

The common difference is 2.