Question

If a and b are the zeroes of the pilynomial f(x)=x2-x-4 then find the value of 1/a+1/b-ab

Answer 1

Answer:

17/4

Step-by-step explanation:

sum of root= -b/a = -(-1) /a= 1

product of roots = c/1 = -4/1= -4

thus, ab=-4 and a+b= 1

so, 1/a+1/b - ab= a+b/ab - ab= 1/4 -(-4) = 4+ 1/4= 17/4