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For me, being a doctor is yes about having a great interest and knowledge of human biology. Human biology is of course what first got me excited about the field of medicine and remains a keen interest of ...

The ways to complete the first one is to realise that it involves a difference of two squares. If you were to see (X^2) with a constant (number), you know they have no factor in common, meaning the two te...

Mn²⁺ + 4H₂O => MnO^{​​​​​}₄^- + 8H⁺  + 5e^-

The proton's relative charge is +1 The neutron's relative charge is 0 The electron's relative charge is -1.

x = (-2 +/- sqrt(4-8))/2                    therefore x = - 1 +/- i, where i is the imaginary unit