Question

if 78=71, 45=29 ,and 12=5 ,then 74= ?
a) 63
b) 33
c) 29
d) 23
find missing number?

Answer 1

a is the answer according to mr

Answer 2

78=7+ 8^2=71; 45=4+5^2=29; 12=1+2^2;

so 74=7+4^2=23