Question

check x=1 and x=-1 are zerosof polynomial x²-¹​

Answer 1

if x= 1
then,
1 ^2 -1
1-1
0
1 is the zero of the polynomial

Answer 2

When x=1,

$1 {}^{2} - 1$

=0.

when x=-1

$( - 1) {}^{2} - 1$

=1-1

=0.

Hence 1 and -1 are roots of the equation