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OpenStudy (anonymous):
3/a^2 + 4/a^2 - 2/a^3
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OpenStudy (anonymous):
7-2/a^2-a^3 ??
OpenStudy (anonymous):
In order to add/subtract fractions with variables, you need to treat them as you would normal numbers. The denominators must be the same, and you're only allowed to change things by multiplying/dividing the top and number by the same value (since x/x = 1 and anything times 1 is itself). 3/a² + 4/a² - 2/a³ Times first two expressions by a. 3a/a³ + 4a/a³ - 2/a³ Same thing as: (3a + 4a - 2)/a³ Simplify. (7a - 2)/a³
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