Factorizing an expressionYou know that , that is to say, . Factorizing is starting from and writing .You can also factorize some expressions using the third remarkable identity, "the other way round" : It is also a factorization as the result is a product. Product equationsProduct equations are equations of the typeIf the product of two numbers is equal to 0, then at least one of the two numbers is equal to 0. If , then a = 0 or b = 0 (or both). In tests, you have to know how to write the following sentence : "A product of 2 factors is equal to 0 if one of the 2 factors is equal to 0". Hence, when you have , you write the sentence, then :
(the author of the website apologizes if « or » is not exactly aside the operations). Problem : solve It’s a product equation. The product of factors is equal to 0 if and only if one of its factors is equal to 0. Hence:
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