Question

Which expression is not a polynomial?

Answer 1

Answer:

1) D

2) D

3) C

4) B

5) C

6) A

7) C

Step-by-step explanation:

1) A polynomial contains integral positive degrees of x .

Though 5 does not contain x, we can take as x power 0

But 3^(1/2)+5 contains no x term, and an irrational term.

Hence option D

2) Grouping like terms and write in descending powers of x we get

d. 9x^3-x^2-x-4 is right answer

3) [4x^2-4x+5] - [3x^2-6x+2] = [4x^2-4x+5] - 3x^2+6x-2

=  X^2+2x+3

So option c

4) By multiplication we get product as

B. 10x^2-7x-12

5) Rectangle area = length x width = (2h-1) (4h+3)

= 8h^2+2h-3

Option C

6) Take common factor b outside

Answer is a. 3b (2b^2+3b-4)

7) Use the identity a^2-b^2

C. (2x+5)(2x-5) is answer