if you look at the question we have equations as
2+9=711
14+6=820;
17+11=628
then 12+3=??
from Equation 1
2+9=711
2+9=(2-9)(2+9)
= 711
here we used a formula called a+b=(a-b)(a+b)
similarly for remainng equations
Equation:2
14+6=(14-6)(14+6)=820
Equation:3
17+11=(17-11)(17+11)=628
now we have 12+3=??
12+3=(12-3)(12+3)=915
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