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A fraction is simply a different way to write a division sum. I.e a \divide b = a/b.

This also applies if the two numbers we're dividing are fractions themselves:

a/b \divide c/d = (a/b) / (...

(x + 7)*(x - 7)

Notice difference of two squares. Very important to learn square numbers, primes and multiples and be able to notice them.

Increased temperature will favour the backward (endothermic reaction.) Any change imposed on the system will be counteracted by a response which reverses the change, i.e. shift the equilibrium in the dire...