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Pooh_ Group Title

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

  • one year ago
  • one year ago

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  1. phi Group Title
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    why don't you replace a with 6 and b with -2 and do the arithmetic?

    • one year ago
  2. Pooh_ Group Title
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    *3a + b^2 + 4b – a

    • one year ago
  3. phi Group Title
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    yes, but you did not put in 6 everywhere there is an "a" and -2 for every b

    • one year ago
  4. Pooh_ Group Title
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    3(6) + (-2)^2 + 4(-2) - 6 is that what you mean?

    • one year ago
  5. phi Group Title
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    yes. now do the arithmetic

    • one year ago
  6. phi Group Title
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    you do know that 3(6) is short for 3*6 (3 times 6) right?

    • one year ago
  7. Pooh_ Group Title
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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

    • one year ago
  8. phi Group Title
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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

    • one year ago
  9. Pooh_ Group Title
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    Wait ..why the 4 isn't -4 ?

    • one year ago
  10. phi Group Title
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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

    • one year ago
  11. Pooh_ Group Title
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    18 + (-4) + (-8) - 6

    • one year ago
  12. phi Group Title
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    do you know that (-2)^2 is short hand for -2 * -2 do you think -2 * -2 is -4?

    • one year ago
  13. Pooh_ Group Title
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    Oh no i didn't know it was -2. Lol thanks for explaining

    • one year ago
  14. phi Group Title
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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

    • one year ago
  15. Pooh_ Group Title
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    Yes, i know that. Thanks

    • one year ago
  16. phi Group Title
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    did you get a final answer?

    • one year ago
  17. Pooh_ Group Title
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    Yes, 8.

    • one year ago
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