Let Px 2x3 5x2 4x 3 a List all possible rational zeros of
Let P(x) = 2x^3 5x^2 4x + 3.
(a) List all possible rational zeros of P. (Enter your answers as a comma-separated list.)
(b) Find the complete factorization of P.
(c) Find the zeros of P. (Enter your answers as a comma-separated list. Enter all answers including repetitions.)
Solution
P(x)= 2x3-5x2-4x + 3
a. To find the possible rational zeroes,we have to use rational zero test
Here constant is 3 and leading coefficient is 2
Factors of constant = +-1,3
Factors of leading coefficient=+-1,2
Possible roots are +-1,3/1,2
b. on using synthetic division for x-3 we get 2x^2 +x-1
f(x)=(x-3)(2x^2 +x-1)
f(x)= (x-3)(x+1)(2x-1)
c. To find the zeroes,we have to plug f(x)=0
(x-3)(x+1)(2x-1)=0
x=3,-1,1/2
