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Pooh_

  • 3 years ago

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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  1. phi
    • 3 years ago
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    why don't you replace a with 6 and b with -2 and do the arithmetic?

  2. Pooh_
    • 3 years ago
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    *3a + b^2 + 4b – a

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

  4. Pooh_
    • 3 years ago
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    3(6) + (-2)^2 + 4(-2) - 6 is that what you mean?

  5. phi
    • 3 years ago
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    yes. now do the arithmetic

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

  7. Pooh_
    • 3 years ago
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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

  8. phi
    • 3 years ago
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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

  9. Pooh_
    • 3 years ago
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    Wait ..why the 4 isn't -4 ?

  10. phi
    • 3 years ago
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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

  11. Pooh_
    • 3 years ago
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    18 + (-4) + (-8) - 6

  12. phi
    • 3 years ago
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    do you know that (-2)^2 is short hand for -2 * -2 do you think -2 * -2 is -4?

  13. Pooh_
    • 3 years ago
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    Oh no i didn't know it was -2. Lol thanks for explaining

  14. phi
    • 3 years ago
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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

  15. Pooh_
    • 3 years ago
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    Yes, i know that. Thanks

  16. phi
    • 3 years ago
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    did you get a final answer?

  17. Pooh_
    • 3 years ago
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    Yes, 8.

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