exam Maths Puzzle Numerical Ability

Hello,
I wanted to know how to complete a quadratic equation if you're only given the ax^2 + bx and NOT provided with the c. Isn't there a simple equation that you can use

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If y=square rootx-2, fill in the following table for x=0,1,2,3,4
x y
0
1
2
3
4
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B) explain why no negative values are chosen as values to subsitute in f A multiple choice test has 30 questions. Each question has five possible answers, of which one is correct. If a student guesses on every question, find the probability of getting exactly 12 correct.