easy one

Algebra Level 2

if a@b = 3a-2b + ab

then 10@4 - 4@10 is .....


The answer is 30.

Omar Nader by Omar Nader , 23, Egypt

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2 solutions

Aniket Rai
Sep 14, 2014

10@4- 4@10 = (3 10-2 4+10 4)-(4 3-2 10+10 4)=30-8+40-12+20-40=30

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hey @oman nader you copy my question

math man - 6 years, 9 months ago

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i am sorry for that if you want to delete problem , tell me
i will delete it

Omar Nader - 6 years, 9 months ago

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no problem , but don't do it anymore :)

math man - 6 years, 8 months ago

10 @ 4 = 3 ( 10 ) − 2 ( 4 ) + ( 10 ) ( 4 ) = 30 − 8 + 40 = 22 + 40 = 62 10@4=3(10)-2(4)+(10)(4)=30-8+40=22+40=\boxed{62} 4 @ 10 = 3 ( 4 ) − 2 ( 10 ) + ( 4 ) ( 10 ) = 12 − 20 + 40 = − 8 + 40 = 32 4@10=3(4)-2(10)+(4)(10)=12-20+40=-8+40=\boxed{32} 10 @ 4 − 4 @ 10 = 62 − 32 = 30 10@4-4@10=62-32=\boxed{30}

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