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13y - 5 = 9y + 2713y - 9y = 27 + 54y = 32y = 32/4y = 8

(y-5)² + y² = 13y²-10y +25 + y²=13.2y²-10y+12=0.y²-5y+6=0.(y-3)(y-2)=0. So, y=3 or y=2. Then substituting these values of y back into x=y-...

Use FOIL to expand the brackets. To do this, we start by multiplying the FIRST value in each bracket which in this case is x so we get x^2. Then we multiply the OUTSIDE two values, so here that is x and -...

To understand surds we have to understand powers and there uses. So to start we should look at powers such as what is 2² , 3², and 5². This shows us going up but then we l...

Firstly you want to factorise this expression. You have n², so you know you want to multiple n by itself. Next, you want to think carefully about what two numbers add to get -...