Help with these math questions please! Check my answers please! Quick! Thanks!

Posted on 2013-11-18 15:43:00 in Math by MYK

1. Which expression is not a polynomial?



Option A: 3 square rootx + 5 <--- my answer



Option B: 5



Option C: 3x^2 + 5x - 4



Option D: 2/5x - 7





2. Use the polynomial to answer the question.

12x^3 + 5 + 5x^2 - 6x^2 - 3x^3 - 2 - x

Which expresses the polynomial in standard form?



15x^3 + x2 - x + 3



15x^6 - 11x^4 - x +7



15x^3 + x2 - x + 3



15x^5 + 3x^2 - x + 4 <-- my answer





3. Use the expression to answer the question.



(4x^2 - 4x + 5) (3x^2 - 6x + 2)



Which is equal to this expression?



x^2 - 10x + 7



12x^2 - 10x + 7



x^2 - 2x + 3 <-- my answer



x^2 + 2x + 3





4. Which is equal to (7x - 3)(5x + 4)?



35x^2 +- 13x - 12 <-- my answer



35x^2 + 43x -12



12x^2 - 13x - 12



12x^2 - 7x - 12





6. Use the polynomial to answer the question.



6b^3 + 9b^2 - 12b



Which represents the polynomial in factored form?



3b^3(2b^2 + 3b - 4)



3b(2b^2 + 9b^2 - 12b)



3b^2(3b^2 + 6b - 9) <-- my answer



3b(2b^2 + 3b - 4)





7. Use the polynomial to answer the question.



4x^2 - 25



Which represents the polynomial in factored form?



(2x - 5)(2x - 5)



(2x + 5)(2x - 5) <-- my answer



(4x - 5)(4x - 5)



(4x + 5)(4x - 5)





8. Use the polynomial to answer the question.

x^2 - 5x + 6

Which represents the polynomial in factored form?



(x - 2)(x - 3)



(x + 2)(x + 3)



(x + 2)(x - 3)



(x - 2)(x + 3) <-- my answer



Hi, I put the answers I think they are. But I'm so confused on these that I'm not sure if any of them are right. If you could correct me if they are wrong that would be very helpful! :) and maybe explain how to do them right. Thanks if you can help! :)

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