Chapter 1.2, Problem 9QR

U.S. Energy Consumption Energy consumptionin the United States in quadrillion BTUs can bemodeled by C(x) = -0.013x2 + 1.281x + 67.147,where x is the number of years after 1970.a. One solution to the equation 87.567 = -0.013x2 +1.281x + 67.147 is x = 20. What does thismean?b. Graphically verify that x = 20 is a solution to87.567 = -0.013x2 + 1.281x + 67.147.c. To find when after 2020 U.S. energy consumptionwill be 87.567 quadrillion BTUs according to themodel, do we need to find the second solution tothis equation? Why or why not?

Solve 5.

write the equation for a quadratic function, which zeros are -3, -1 and 2 (order 2) and passes through the point (1,4)