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Gelneren [198K]
3 years ago
14

URGENT!!! Please answer ASAP with full working out thank you

Mathematics
1 answer:
Tema [17]3 years ago
6 0

Step-by-step explanation:

a) \\  \frac{a}{x - 1}  -  \frac{2}{x + 1}  =  \frac{4}{(x - 1)(x + 1)}  \\  \\  \frac{a(x + 1) - 2(x - 1)}{(x  -  1)(x + 1)} =  \frac{4}{(x - 1)(x + 1)}  \\  \\ a(x + 1) - 2x + 2 = 4 \\  \\ a(x + 1) = 4 + 2x - 2 \\  \\ a(x + 1) = 2x + 2 \\  \\ a (x + 1) = 2(x + 1) \\  \\ a= \frac{2(x + 1)}{(x + 1)}  \\  \\  \huge \red{ \boxed{a = 2}}

Solve b part yourself in the same way.

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sattari [20]
<h3>Answer: Choice D. 2, 6, 12, 20</h3>

=============================================

Work Shown:

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Plug in n = 3

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The third term is 12

-------------

Plug in n = 4

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