t^4-40t^2+40=0
I will assume you are trying to solve.
t^4-40t^2+40=0
I first solved for t^2 using the quadratic formula
to get t^2 = 20 +-√360
both of which are positive
then t = +-√(20 +-√360) which represents 4 answers
t^4-40t^2+40=0
I first solved for t^2 using the quadratic formula
to get t^2 = 20 +-√360
both of which are positive
then t = +-√(20 +-√360) which represents 4 answers