Which equation shows the quadratic formula used correctly to solve 7x2 = 9 + x for x?
-1+
((719)
2(7)
x-1
ox=--
(-1)-47)(9)
2(7)
-1 +
(-1)2 +4(7)(9)
2(7)
(-1)2 +4(7(9)
207)
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Do some research and find a city that has experienced population growth. determine its population on january 1st of a certain year. write an exponential function to represent the city’s population, y, based on the number of years that pass, x after a period of exponential growth. describe the variables and numbers that you used in your equation.