Answer:
52
Step-by-step explanation:
b(a+b) is equal to 4(9+4)
then you want to multiply 4x9 and 4x4
4x9=36 and 4x4=16
then add 36 and 16 you get 52
or
b(a+b) is equal to 4(9+4)
add 9+4
9+4=13
then you get 4(13)
multiply 4x13 and you will get 52
4x13=52
