Verified Answer :

Insidious

Formula: a + b = c × a - a

2+3 = 5
5 × 2 = 10 
10 - 2 = 8 

3 + 7 = 10
10 × 3 = 30
30 - 3 = 27

4 + 5 = 9 
9 × 4 = 36 
36 - 4 = 32

5 + 8 = 13
13 × 5 = 65
65 - 5 = 60

6 + 7 = 13 
13 × 6 = 78
78 - 6 = 72

7 + 8 = 15
15 × 7 = 105
105 - 7 = 98 

Answer: 7 + 8 = 98

Assuming that your looking for a pattern this is what I was able to find...

23= 6+(21)=8

37= 21+(32)=27

45= 20+(43)=32

58= 40+(54)=60

67= 42+(65)=72

78= 56+(76)=98

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