Question

If the product of roots of the equation x² – 3 (2a +4)
x + a? + 18a + 81 = 0 is unity, then a can take the
values as
(a) 3, -6
(b) 10,-8
(c) -10,-8
(d) -10,- 6

Answer 1

Answer:

if you need to check the number of roots or zeros of an equation you just count to the maximum power of the equation.

for example :

ax^4+bx^3+cx^2+dx+e=0

its highest or maximum power is 4 means it has four roots or zeros. as you can notice "ax " has power 4 which is the maximum in the equation.