Question

if 3 is a zero of the polynomial x cube - 13x + 12 find the other zeros

Answer 1

$\huge\tt\underbrace\red{ANSWER}$

dividing f(x) by (x+1), we get

x3−13x−12=(x+1)(x2−x−12)

=(x+1)(x2−4x+3x−12)

=(x+1){x(x−4))+3(x−4)}

=(x+1)(x+3)(x−4)