Answer:
7/ (3a-1)
Step-by-step explanation:
3a^2 -13a +4 28+7a
------------------ * --------------------
9a^2 -6a+1 a^2 -16
Factor
(3a-1)(a-4) 7(4+a)
(3a-1) (3a-1) (a-4)(a+4)
Cancel like terms
1 7
(3a-1) 1
Leaving
the base of the ladder is 18ft away from the wall