exam Maths Puzzle Numerical Ability

I need help finding the vertex of the parabola

f(x)=-x2+3x-1

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exam Other Question

faxtor: 12w2+10w-8
factor 4k2+20k+25
factor: 16e2-4
factor: 3a2+9a+6

thank you for your help the area of the pool is x squared plus 16x plus 48.what are the dimensions?