Consider the equation x^2+12x+c=0 Pat A if c= -28, list the steps to solve the equation above by completing the square, and give the solution or solutions.

Part B Explain what value or values of c make the equation above have one and only one solution.

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)