Use the formula 0 = b^2-4ac
0 = -b^2-4(2)(-9)
0 = -b^2+72
b^2 = 72
b = square root of 72
b = 2 real numbers
Answer:
you have to use the quadratic equation to find the zeros
Step-by-step explanation:
The answer to the question is 4 hours. After 4 hours they will have learned $60.
The correct answer is actually A because $2.50 is a cost per hour the skates are rented for. Hope this makes sense.
The fully factored form of this expression would be
(A-5)(A+4).
