Rate Law for A+B Reaction: k[A][B]^2

[tica86]

) If the rate law for the reaction
2A + 3B → products
is first order in A and second order in B, then the rate law is rate

I initially thought the answer would be k[A]^2 but it's wrong, the correct answer is
k[A]^2
Could anyone explain?? Please, thank you!

 

[PhaseShifter]

"first order in A" means "Proportional to [A]"

"Second order in B" means "Proportional to ²."

Put those together and what do you get?