book Maths Puzzle Numerical Ability

please help me {x-2}<1 need to graph it

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A school has 5000 lockers. They are all closed. THere are 5000 students. Student number one goes through and opens every locker because each locker number is divisible by one. Stud I don't understand how this problem was worked out? f(x)=-4x2+x+1 by using the vertex formula to determine the vertex of the graph of the function.