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Identify a common denominator4( x + 1)/12 + 3(2 x + 5)/12 (= 2)2. Expand both brackets(4 x + 4)/12 + (6 x + 15)/12 = 23. Multiply out the denominator4 x + 4 + 6 x + 15 = 12× 24. X's on one side, numbers on t...

The dual nature of light. Sometimes it behaves as a particle, sometimes as a wave.

You take the power of X down and multiply the term by it. Then you reduce the power of the term in X by 1.

Divide the term in x by 2 and then put it in the bracket which will be squared. The last term from that expansion needs to be adjusted for.

A good way to remember which form of the past tense to use is to think about when the action took place. The imperfect (with endings -aba and -ía) is used for continuous actions in the past, so you would use...