Question

2+2 =4
3+3=10
4+4=18
5 +5 =28
7+7 =?

Answer 1

many answers
Method 1
2+2= 4 as 4*1
3+3= 10 as 5*2
4+4= 18 as 6*3
similarly 8*5= 40

or
yes
2*2+(2-2)=4
3*3+(3-2)= 10
4*4+(4-2)= 18
similarly
7*7+(7-2)= 49+5= 54