If $a?b = 3a^2 + 2b - 1,$ then $2?3 =$ - The Beat The GMAT Forum

If $a?b = 3a^2 + 2b - 1,$ then $2?3 =$

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Gmat_mission: Legendary Member; Posts: 1622; Joined: Thu Mar 01, 2018 7:22 amFollowed by: 2 members

by Gmat_mission » Wed Sep 23, 2020 5:31 am

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If $a?b = 3a^2 + 2b - 1,$ then $2?3 =$

A. 12
B. 17
C. 30
D. 37
E. 41

Answer: B

Source: Princeton Review

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Source: Beat The GMAT — Problem Solving | Wed Sep 23, 2020 5:31 am

deloitte247: Legendary Member; Posts: 2214; Joined: Fri Mar 02, 2018 2:22 pmFollowed by: 5 members

Re: If $a?b = 3a^2 + 2b - 1,$ then $2?3 =$

by deloitte247 » Fri Sep 25, 2020 6:31 pm

$$2?3=3\left(2^2\right)+2\left(3\right)-1$$
$$=3\left(4\right)+6-1$$
$$=12+6-1=17$$
Answer = B

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