Write a quadratic equation in the form x^2+bx+c that has the following roots: -9 +- 3i

What is the missing constant term in the perfect square that starts with x^2 -20x

Equation for the calculation double 2 and then add 5

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 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)