2 points

which of the following expresses the possible number of positive real

solutions for the polynomial equation shown below?

x^3 - 4x^2 – 7x+ 28 = 0

o

a. three or one

b. two

c. one

d. two or zero

Two or zero expresses the possible number of positive real  solutions for the given polynomial equation.

Option D

Step-by-step explanation:

Given equation:

First, we put hit and trial method to find out the one solution. So, if we put x=4 then the above expression will become zero.  We can also write the above expression as  

We know the formula, , make use of this, we get

So,

Hence, from the above expression, we have three values of x as x= 4, 2.64 and -2.64

7. d. 64

8. i. 32

9. c. 125

10. j. none of the above

11. d. 81

12. i. 216

13. e. none of the above

14. g. 240

15. e. none of the above

16. g. 32

17.   e. none of the above

take it another