Question

find the roots of the quadratic equation x2 - 9 =0

Answer 1

=》 x^2 -9 = 0

=》 x^2 = 9

=》 x = +-3

Answer 2

Hello,
we have that:
x²-9=0;
(x+3)(x-3)=0;
x+3=0 or x-3=0;
x=-3 or x=3

then
x=±3

bye :-)