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firstly explain (x-3)² = (x-3)(x-3) on the whiteboard I'd draw a square grid with each of the numbers, then I'd multiply out. E.g. x multiplied by x = x²; x multiplied by -3 = -3x an...

There are 2 ways to solve simultaneous equations which are by substitution or elimination. In this example you can use both but elimination is simpler. So we have 2x + 7y = 14 and x + y = 2. To use elimin...

With the methods we know at A Level we cannot current differentiate x^x in its current form. Therefore let y = x^xTo turn it into a form we can differentiate we take the natural log o...

This question is an example of compound interest rates. The question asks to find the interest rate of the bank. So first of all we should form an equation relating our initial amount, interest rate, time...

X=2Y=1