Notice that the top will factor as [4 - √a] [4 + √a]
So we have
lim as a → 16 [4 - √a] [4 + √a] / [4 - √a] =
lim as a → 16 [4 + √a] =
4 + √16 = 4 + 4 = 8
Answer is 21
Answer x=30
£13784.22
