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If £160 = 100%, the number we are trying to find (let's call this X) equals 145%. (Place numbers in 2x2 grid) 100%    £160 145%     X Multiply the two diagonal numbers together, then divide by the number ...

• The behaviour of the solution depends on the value of the discriminant, D = b² – 4ac, (aptly named as it allows you to discriminate between solutions)

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(I assume I can use the whiteboard in an actual lesson/interview)

So this question might seem quite simple, and maybe it is, but this type of question can catch many students out. The first step is...

1. Collect like terms 2x - x +6y +2y 2. Simplify like terms 2x - x = x 6y+2y=8y 3. Write final answer x + 8y