exam Maths Puzzle Numerical Ability

Find the maximum value of y=-x^2+6x.

Thank you.

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exam Other Question

how do you graph f(x) = {x + 2 if x < -2 or 2x - 1 if x greater than or equal to - 2} ?? Hello,
I tried to work out this problem: 2x^4+10x+8=0 and i got that x=+ or - i and x=+ or - 2i.
Would you mind looking over those answers and telling me if they are correct?
Thank you so much!
Kendall