Question

(t²-2)(t²-5)
please answer

Answer 1

t^4-2t^2-5t^2+10=0

t^4-7t^2+10=0

t^4-7t^2=-10

t^2(t^2-7)=-10

t^2=-10 t^2-7=-10

t=√10i t^2=-3

t=√3i

the solution is t=√10i and √3i

Answer 2

Here is my answer:

Hope it help