exam Maths Puzzle Numerical Ability

How do I grapgh the function that has the following properties: concave up, y-intercept is -6, zeros at x = -2 and x = 3?

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exam Other Question

one number is equal to two times a second number. two time the first number plus two times the second number is 24. if you let x stand for the first number and y for the second, what are the two number. sqrt (3)/ sqrt (6)-1 - sqrt (3)/ sqrt (6)+ 1

After working it out, I got sqrt (3) - sqrt (3) for my answer. I don't think I did it right. Can you please help?