Question

1+4 = 5 2+5 = 12 3+6 = 21 5+8 = ...

Answer 1

$\huge\bold\red{Answer:}$

1+4= (1×4+1)=5

2+5=(2×5+2)=12

......

similarly

5+8=(5×8+5)=45

Answer 2

34 is answer bro / sis

because

1+4=5

5+2+5=12

12+3+6=21

so

21+5+8=34 answer