exam Maths Puzzle Numerical Ability

how do you solve and then graph the parabola: y= -x(to the second power) + 2x+3

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exam Other Question

FIND THE MEAN AND THE MEDIAN OF THE FOLLOWING SET OF NUMBERS:

-10, -4, 5, 9, 11, 13

THANKS
JMS Factor f(x) = 9x^3 + 18x^2 + 11x + 2 given that -1 is a zero of f(x)