Need help

3.16

y=-16(t*t)+38t+40

y=-16*t²+38t+40

y=-16*(t²+38t)+40

y=-16*39t²+40

y=-16*40 ----- (39t²+)

y=-640+39t²

I spent 15 minutes on this 'til I realized the word "Range".

I'm so dumb...