Question

If alpha and bita are the zeros of the polynomial f(X) = 6 X square + X - 2 , find the value of 1 / a + 1 / b - ab.

Answer 1

Answer:

Correct option is

D

−

12

25

f(x)=6x

2

+x−2

a,b are its zero's / roots.

a+b=

6

−1

,ab=

6

−2

=−1/3

b

a

+

a

b

=

ab

a

2

+b

2

=

ab

(a+b)

2

−2ab

=

(−1/3)

(−1/6)

2

−2(−1/3)

=

−1/3

36

1

+

3

2

=−(

12

1

+2)=

12

−25