2/a-1 + 4/a+2 =.....

[tex] \frac{2}{a - 1} + \frac{4}{a + 2} \\ = \frac{2(a + 2) + 4(a - 1)}{(a - 1)(a + 2)} \\ = \frac{2a + 4 + 4a - 4}{a ^{2} + 2a - a - 2 } \\ = \frac{2a + 4a + 4 - 4}{a ^{2} + a - 2 } \\ = \frac{6a}{a ^{2} + a - 2} [/tex]
Maaf Kalau Salah

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