What does the following expression mean? 7! This is permutations.
1 answer:
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- Simplify ⇨ 1/x(x+a) + 1/x(x-a)
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of and
is
. Multiply
. Multiply
.
Because and
have the same denominator, add them by adding their numerators.
Combine like terms in x-a+x+a.
Cancel out x in both the numerator and denominator.
Expand .