Question

in an ap prove that a(m+
n) +a(m-n)=2am

Answer 1

Answer:

Step-by-step explanation:

a(m+n)+a(m-n)=2am

(am+an)+(am-an)=2am

That is , am+an+am-an=2am

am+am+an-an=2am

am+am=2am