Question

If 2 zeros of polynomial x cube -5xsquare +17x+13 are 21 and 23 find the third zero

Answer 1

given
5x
$x ^{3} - 5 {x}^{2} + 17x + 13$
now given zeroes are (x-21) and (x-23)
$x - 21 \times x - 23 \\ x {}^{2} - 23x - 21x - 293$
dividing this by above equation will get you the answer