(a+b)2=a2+2ab+b2
(a-b)2=a2-2ab+b2
(a+b)(a-b)=a2-b2
these are the standard identities
another one:
(x+a)(x+b)=x2+(a+b)x+ab
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they are the simple rules in algebra which make calculations a lot easier
You use standard form in algebra because you have to know the number before you answer the problem
Well, if we're talking algebra, then standard form is ax+by=c
It depends a little on where you are attending school and what courses you have already completed. Usually, Geometry is standard for 10th graders. You usually take geometry after you take Algebra 1 in 9th grade. However, I took Algebra 1 in 8th grade, Geometry in 9th, and Algebra 2 in 10th. So, if you're a little behind in math, you might take Algebra 1. If you're average, you might take Geometry. If you're ahead, you might take Algebra 2.
An equation in which the variable(s) can take any value and it is still true. ex. cos(x) = cos(-x) sin(x) = -sin(-x) The above equations are true for any real value of x. Identities are sometimes written with a "triple equals sign", as in 3 parallel lines rather than 2.