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In this question I would initially aim to get an a on both sides of the equation. My first step would be to multiply both sides by (4-a) to do this. After this point I would expand out the brackets on ...

Both ser and estar translate in English as 'to be'. Ser and estar, however, are very different in both meaning and usage. 

First of all it is important t...

Step 1: The first step is to rewrite the equation in the form ax² + bx + c = 0. So in this case, we achieve this by...