book Maths Puzzle Numerical Ability

Please help me with this question: Name the x-intercepts and the vertex of the graph of y=(x+3)(x-1). Then sketch the graph of the function.

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book Other Question
If a, b, and c are consecutive positive integers, show that 6/5<=A/(B+C) +B/(C+A)+C/(A+B)<=2 The angles of a polygon add up to 2700 degrees. How many sides does the polygon have?