Question

if a and b are roots of x2 - 9x + 20

then ab is​

Answer 1

Answer:

x2 -9x +20

ab = 20

x2 -4x -5x +20

x( x-4).-5( x-4)

( x-5)( x-4) = 0

x= 5,4

5(4) = 20