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Factorise to get (x+3)(x-7)=0 
So you can see that x = -3 or x =7 

When seeing this sort of question, I would handle it by explaining what both a receptor and an effector is firstly and giving examples. Secondly, I would explicitly state the difference to make sure the a...

An endothermic process is one which cools as the reaction proceeds meaning that the entropy change of the reaction will be negative. These reactions may still be feasible as the spontaneous nature of a re...

When I answer essay questions, I always try and stick to a 'rule of three'. This means that the body of the essay (everything between the introduction and the conclusion, where you actually make your case...

Primary structure: Amino acids (AAs), the building blocks for all proteins, are linked together by peptide bonds. The primary sequence tells you the AAs in the protein but n...