Binomial expansion Watch

connor.beja
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I've expanded part (a) correctly, but I've completely forgotten how part (b) works. Any help?
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dextrous63
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Moving everything over to one side will create a new quadratic, which you can solve as you see fit.

Just make sure that your solutions satisfy the criteria for the expansion to be valid.
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RDKGames
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(Original post by connor.beja)
I've expanded part (a) correctly, but I've completely forgotten how part (b) works. Any help?
\dfrac{1}{\sqrt{1+2x}} = (1+2x)^{-1/2}

From your theory, the expansion for (1+x)^{n} if |x| < 1 so in your question you should set |2x| < 1.
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ohemgee11
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Just in case you needed the calculation
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