You need to learn it, so you can learn Greatest Common Factor, which you need to reduce fractions.
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6x^2-x-1
trial & error is a general method of problem solving, fixing things, or for obtaining knowledge.
Introduces the student to the fundamental concepts of algebra. Topics include the following types of expressions and equations: linear, rational, and radical. Other topics covered include exponents, functions and factoring
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Some 7th graders do Algebra, but 8th graders are supposed to.