Answer:
(x + 3)(x - 3)
Step-by-step explanation:
Use difference of squares property:
(x + 3)(x - 3)
0.07x+0.0825(9000-x)=706.25
Solve for x
X=2900 at 7%
9000-2900=6100 at 8.25%
Setting up and solving an equation of ratios is one of the fastest ways in which to solve this kind of probelm.
183 miles 3 hrs
-------------- = ------------
x 11 hrs
Do the math. You'll find that x = 671 miles.
The answer is (1) x=-2. The property of the equation like y=ax2+bx+c is that the axis of symmetry of the graph is x=-b/2a. So for this question, the axis is x=-4/2=-2.