exam Maths Puzzle Numerical Ability

Hi,

Help on this one would be greatly appreciated!

How do we find D if it is in the form ax^2 + bx = c?

D= Discrimatory

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exam Other Question

"Find three consecutive even numbers whose sum is -90"

thanks
Solve the following proportion for y:

the fraction Y over 6 = the fraction of y + 1 over 4