exam Maths Puzzle Numerical Ability

For what values of 'a' is the opposite of 'a' greater than 'a'? less than 'a'? equal to 'a'?

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exam Other Question

Can you helf me find the parabola of the form Y=ax^2+bx+c

(0,0),(-4,-36),(2,-18) I was able to use the quadratic calculator for some of the problems, but this one I do not think I can:
Solve by using the quadratic formula:
x^2 = 5x - 5

Please help! Thank you