Question

9. If a and B are the zeroes of the quadratic polynomial
f(x) = x^2-x-4, then the value of 1/a +1/b-ab
is​

Answer 1

Answer:

1/a + 1/b - ab = (a + b)/ab - ab

From the relationship between zeroes and coefficients,

= (-1)/(-4) - (-4)

= 1/4 + 4

= (1+4)/4

= 5/4