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One pair of positive integers solving 1/x + 1/y = 1/7 is easy to spot by symmetry. The hard part is the word EVERY: how would you ...

Trying to solve a quadratic equation without knowing how to factor is like trying to fix a car without a wrench. You can stare at the ...

In this video I go through all the different factoring methods used in Pre-Calculus and work through many examples. #precalculus ...