Mathematics

Richard Sutton

5 February, 07:22

An icicle drips at a rate that can be represented by the function f (x) = - x2 + 8x - 7, where 0 ≤ x ≤ 10 and x is the number of hours after the sun has risen. When f (x) is a negative number, the icicle is not dripping. Determine the values when the icicle starts and stops dripping.

A) x = - 1 and x = 7

B) x = 1 and x = 7

C) x = 1 and x = - 7

D) x = - 1 and x = - 7