Question

please answer my question

answer is D but explain me how to do it........ ​

Answer 1

Answer:

The number of roots of a polynomial equation is given by the degree of the polynomial.

Example:

(i) ax+b=0 is a polynomial equation with degree one. Hence, the equation will have one root.

(ii) ax²+bx+c=0 is a polynomial equation with degree two. Hence, the equation will have two roots.

(iii) ax³+bx²+cx+d=0 is a polynomial equation with degree three. Hence, the equation will have three roots and similarly

(iv) ax^{4}x

4

+bx³+cx²+dx+e =0 is a polynomial equation with degree four. Hence, the equation will have four roots.

In this case, the equation x^{4} -x^{2} +2x-1=0x

4

−x

2

+2x−1=0 is a 4 degree polynomial equation and hence it will have 4 roots

Answer 2

Answer:

option d is correct.

Step-by-step explanation:

since the highest power is 4 so, it has 4 real roots.