Could you explain this solution to me, please? Why 81-4d> 0, and why not 81+4d>0? How do we decide which one should be bigger than 0?
Yes, ideally either approach should be correct.
Meaning that ‘d’ could be either +20.25, or -20.25.
@Leaderboard is a rectification in the question required? To make it less ambiguous. Maybe what is the value of |d| ?
d cannot be 20.25 as y will never touch the x-axis in that case.
Ohh yes that makes sense.