# binomial expansion a level maths help

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Thread starter 1 month ago
#1
I get it now// ignore
Last edited by o_reo; 1 month ago
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1 month ago
#2
Write the denominator as
(4+x^2)^(-1/2)
And expand both terms, then multiply to get the cubic coefficient.
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Thread starter 1 month ago
#3
(Original post by mqb2766)
Write the denominator as
(4+x^2)^(-1/2)
And expand both terms, then multiply to get the cubic coefficient.
thank you !!
1
Thread starter 1 month ago
#4
(Original post by mqb2766)
Write the denominator as
(4+x^2)^(-1/2)
And expand both terms, then multiply to get the cubic coefficient.
in the denominator how would you get the coefficient of x^3 because for the fourth term the x value is (x^2 /4 )^3
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1 month ago
#5
(Original post by o_reo)
in the denominator how would you get the coefficient of x^3 because for the fourth term the x value is (x^2 /4 )^3
You'd only get even powers in that expansion, so which terms would end up (multiplied by the other expansion) with a cubic?
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