Question

12-9=11,18-6=39,21-7=139,16-5=?

Answer 1

Step-by-step explanation:

2=5,4=18,6=39,8=68,10=105

ans:2=2×2+1=5

4=4×4+2=18

6=6×6+3=39

8=8×8+4=68

10=10×10+5=105

I hope it will help you