How would you do practise test 3, section 3, question 16? I plugged in 1 and happened to get the answer. But is there an algebraic way to do it?


Sure. Algebraically, you can do it in a few steps:


You can actually go further by expanding the differences of two squares if you want (below), but because the question tells you that x> 0, you know from the above that it can either be 1 or 2.


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