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

Mathematics
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  • phi
why don't you replace a with 6 and b with -2 and do the arithmetic?
*3a + b^2 + 4b – a
  • phi
yes, but you did not put in 6 everywhere there is an "a" and -2 for every b

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Other answers:

3(6) + (-2)^2 + 4(-2) - 6 is that what you mean?
  • phi
yes. now do the arithmetic
  • phi
you do know that 3(6) is short for 3*6 (3 times 6) right?
Omg of course ...I already did what you're talking about. I just never get the same answer as the multiple choice
  • phi
do it in steps what is 3*6 what is (-2)^2 what is 4*-2 -6 now add them up
Wait ..why the 4 isn't -4 ?
  • phi
3(6) + (-2)^2 + 4(-2) - 6 write the answers to each multiplication (or square for (-2)^2 ) below each term
18 + (-4) + (-8) - 6
  • phi
do you know that (-2)^2 is short hand for -2 * -2 do you think -2 * -2 is -4?
Oh no i didn't know it was -2. Lol thanks for explaining
  • phi
btw, if you see (-2)^3 that means -2* -2 * -2 which is (-2*-2) * -2 or 4*-2 or -8
Yes, i know that. Thanks
  • phi
did you get a final answer?
Yes, 8.

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