The archway to the entrance of an art gallery can be model by y= -1/3(x-5)(x+5) where x and y are measured in feet. The x-axis r

Question

3 years ago

11

epresents the floor. Find the width of the arch at floor level.

1 answer:

NikAS [45] · Answer 1 · 2022-05-14T15:13:32+03:00

NikAS [45]3 years ago

3 0

Answer:

x=5 feet

Step-by-step explanation:

At floor level y=0

If the expression is:

$0=1/3(x-5)(x+5)\\0=1/3(x^2-25)\\0=1/3x^2-25/3\\25/3=1/3x^2\\25=x^2\\x=5$

But, with the negative sign, the answer is x= 5i (where i is imaginary)