exam Maths Puzzle Numerical Ability

Please help me on how to figure out the vertex of the equation y=x2(this is x squared)-2x-3.

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exam Other Question

Please help me solve this problem:
2(x-6)+2=4(x+2)-12 At 9 am a truck leaves the truck yard and travels west at a rate of 50 mph. Two hours later, a second truck leaves along the same route, travelling at 75 mph. When will the second truck catch up to the first?

~Thanks