Question

give the zeros of the polynomial t^2-15

Answer 1

$\sqrt{15 \: } \: and \: - \sqrt{15}$

Answer 2

=t²-15
=(t)²-(√15)²
[USING a²-b²=(a+b)(a-b) ]
=(t+√15)(t-√15)
t=-√15 or √15