the science department buys equiptment shown in the table and they bought all three items this year and how many years will they have to buy all three items again​

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a

if you are looking for the unit rate then the answer would be 9 because unit rate is distance divided by time.

step-by-step explanation: