Pooh_
Evaluate the following expression for a = 6 and b = 2
3a + b2 + 4b – a
A. 4
B. 12
C. 8
D. 16



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phi
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why don't you replace a with 6 and b with 2 and do the arithmetic?

Pooh_
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*3a + b^2 + 4b – a

phi
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yes, but you did not put in 6 everywhere there is an "a" and 2 for every b

Pooh_
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3(6) + (2)^2 + 4(2)  6 is that what you mean?

phi
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yes. now do the arithmetic

phi
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you do know that 3(6) is short for 3*6 (3 times 6) right?

Pooh_
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Omg of course ...I already did what you're talking about. I just never get the same answer as the multiple choice

phi
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do it in steps what is
3*6
what is (2)^2
what is 4*2 6
now add them up

Pooh_
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Wait ..why the 4 isn't 4 ?

phi
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3(6) + (2)^2 + 4(2)  6
write the answers to each multiplication (or square for (2)^2 ) below each term

Pooh_
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18 + (4) + (8)  6

phi
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do you know that (2)^2 is short hand for 2 * 2
do you think 2 * 2 is 4?

Pooh_
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Oh no i didn't know it was 2. Lol thanks for explaining

phi
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btw, if you see (2)^3 that means 2* 2 * 2 which is (2*2) * 2 or 4*2 or 8

Pooh_
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Yes, i know that. Thanks

phi
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did you get a final answer?

Pooh_
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Yes, 8.