exam Maths Puzzle Numerical Ability

DETERMINE THE VERTEX OF y=x2-8x+22.

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Dear,tutor help me to solve this problem #18 (9,10)please. My problem is a division one....

(P^-5)^-9(P^-6)^4 divided (P^-8)^0(P^4)^-5

I need help with this one......negative exponents