5. Factor 49t2 – 9.
(7t + 3)(7t + 3)
(7t + 3)(–7t – 3)
(7t + 3)(7t – 3)
7t – 3
6. The area of a rectangular field is given by the trinomial t2 – 4t – 45. The length of the rectangle is t + 5. What is the expression for the width of the field?
t – 9
t – 5