Solution
Since the function has at least one rational zero, we can apply fthe actor theorem
The factor theorem states that if f(x) is a polynomial of degree n greater than or equal to 1, and 'a' is any real number, then (x - a) is a factor of f(x) if f(a) = 0.
since f(1) = 0, f(-2) = 0
=> (x + 2) is a factor of f(x)
=> X - 1 IS also a factor

Solving
