Question

Prove that -10,-6,-2,2 is an AP

Answer 1

a1=-10
a2=-6

a3=-2

To be in A.P

a2-a1=a3-a2

4=4
hence proved terms are in A.P

Answer 2

2-(-2)=4
-2-(-6)=4
-6-(-10)=4
We get that difference is same that is 4 now we have a common difference and hence its an ap