For all numbers m and n...

For all numbers m and n, $$m?n=(2m-n)(m+n).$$ If m = 3 and n = 4, then n?m =

A. 35
B. 14
C. 7
D. âˆ’7
E. âˆ’14

[spoiler]OA=A[/spoiler]

Source: Princeton Review

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by Brent@GMATPrepNow » Sat Apr 06, 2019 6:54 am

Gmat_mission wrote:For all numbers m and n, $$m?n=(2m-n)(m+n).$$ If m = 3 and n = 4, then n?m =

A. 35
B. 14
C. 7
D. âˆ’7
E. âˆ’14

[spoiler]OA=A[/spoiler]

Source: Princeton Review

GOAL: Find the value of 4?3

GIVEN: m?n = (2m - n)(m+ n)
So, 4?3 = (2(4) - 3)(4+ 3)
= (5)(7)
= 35

Answer: A

Cheers,
Brent

Brent Hanneson - Creator of GMATPrepNow.com

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