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Can you check my answers and help with number 3?
1. Which expressions are polynomials? Select EACH correct answer.
A: 8x2(3^y) <----
B: 9x2(y/5)
C: 3y2(x 1/4)
D:4x2(y^5)<-----

2. Which description is correct for the polynomial 3x3+4x2−7?


A: quartic trinomial

B: cubic trinomial

C: cubic binomial <-----

D: quadratic trinomial

3. What is the degree of the polynomial −6x3y2+5x4−7z?

4.Simplify.

(5x−2+3x2)+(4x+3)

A: 3x2+x+5

B: 12x4+1

C: 3x2+9x−1 <-----

D: 3x2+9x+1

5. Simplify.

(5x^2+2x−5)−(3x^2+3x+1)


A: 2x^2−5x+4

B: 2x^2+5x−4 <----

C: 2x^2−x−6

D: 8x^2+5x−4

Respuesta :

Answer: Question 1 :B,D.

Question 2:option B,

Question 3:Degree=5.

Question 4:option D.

Question 5: option c.


Step-by-step explanation:

1) A polynomial can not have any exponent as a variable or a fraction.

Options B and D are polynomials.

2) The polynomial is having 3 terms and is of degree 3.so it is a cubic trinomial Option B.

3) Degree is the highest power of the variables in the terms .The term [tex]6x^{3} y^{2}[/tex] has the power=3+2=5

So degree =5.

4)[tex](5x-2+3x^{2} )+(4x+3)=3x^{2} +5x+4x-2+3=3x^{2}+9x+1.[/tex]

Option D


5)[tex](5x^{2} +2x-5)-(3x^{2}+3x+1)= 5x^{2}+2x-5-3 x^{2}-3x-1[/tex]

Simplifying like terms,

=[tex]2x^{2}-x-6.[/tex]

Option c.


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