Question

verify whether x=3 is a zero of the polynomial x2 +2x-15

Answer 1

given :- x = 3

(3)^2 + 2(3) - 15

=> 9 + 6 -15

=> 15 - 15

=> 0

Hence, it is a zero of this polynomial.

HOPE IT HELPS YOU...

Answer 2

so lets start
3×2 + 2×3-15=0
6+6=15
12=15
so it is not