exam Maths Puzzle Numerical Ability

For the following parabola, find the x-axis intercepts and the
coodinates of the vertex:

-x2 + 11x - 18


I have not a clue on how to start this,,please help me!!!
ThAnKs!

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exam Other Question

simplifly the following :


1) 3x^3 y^4 z^-2 / 6x^-1 y^3 z^-3



2)36^1/2 / 15^2
Rewrite in a single quanity
ln(5) + 2ln(x)-3ln(z)