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Janu16

  • one year ago

Given the expression 5a^2b – 13ab + 7a^3 – 4b, do the following as instructed below:

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  1. Janu16
    • one year ago
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    A.Write the polynomial in descending order. B.Classify the polynomial by the number of terms. C.State the degree of the polynomial.@phi

  2. Janu16
    • one year ago
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    @phi

  3. Janu16
    • one year ago
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    so would it be this for A 7a^3=5a^2b-13ab-4b?

  4. Janu16
    • one year ago
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    @peachpi

  5. anonymous
    • one year ago
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    yes assuming the = was a typo

  6. phi
    • one year ago
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    yes , = means +

  7. Janu16
    • one year ago
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    ys its +

  8. Janu16
    • one year ago
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    so do you guys think thats correct descending order

  9. phi
    • one year ago
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    yes. In theory we could order it according to the "b"s , but the a's have a higher power

  10. Janu16
    • one year ago
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    ok so its correct. So for B I said the term is polynomial

  11. Janu16
    • one year ago
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    is that correct

  12. phi
    • one year ago
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    yes, but they also want the number of terms (things between the + or -)

  13. Janu16
    • one year ago
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    4?

  14. phi
    • one year ago
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    yes, it is a 4 term polynomial

  15. Janu16
    • one year ago
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    so they don't want the name but they want number?

  16. Janu16
    • one year ago
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    I need help with degree part c

  17. phi
    • one year ago
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    they want "4 term polynomial" the degree is the biggest exponent. easy to find, because we order the terms from biggest exponent to smallest

  18. Janu16
    • one year ago
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    but doesnt 2 of them have 3 as degree?

  19. Janu16
    • one year ago
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    5a^2b is 3 right? and 7a^3 is also 3

  20. phi
    • one year ago
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    yes, we should count a^2 b as degree 3 but what we care about is the term with the biggest exponent. (in this case 3) it does not matter if there are more than one term with that degree.

  21. Janu16
    • one year ago
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    so 7a^3 is the degree?

  22. phi
    • one year ago
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    no. just 3 if we did not have 7a^3, the degree would still be 3 (because of the 5a^2b) and if we did not have either of those, the degree would be 2 (from -13ab)

  23. Janu16
    • one year ago
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    so i just write 3 where it says state the degree of the polynomial

  24. phi
    • one year ago
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    yes

  25. Janu16
    • one year ago
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    ok thanks again!

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