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C2 DOUBT edexcel

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astarmathsandphysics:
Ok will do it when I get home

astarmathsandphysics:
(2+x)^6=1*2^6*x^0+6*2^5*x^1+15*2^4*x^2+20*2^3*x^3+....
=64+192x+240x^2+160x^3....
Now replace all the x's by x-x^2
64+192(x-x^2)+240(x-x^2)^2 +160(x-x^2)^3
64-192x-192x^2+240(x^2-2x^3)+160x^3 ignoring all powers of x higher than x^3
=64+192x+48x^2-320x^3

halosh92:

--- Quote from: astarmathsandphysics on February 27, 2010, 06:36:55 pm ---(2+x)^6=1*2^6*x^0+6*2^5*x^1+15*2^4*x^2+20*2^3*x^3+....
=64+192x+240x^2+160x^3....
Now replace all the x's by x-x^2
64+192(x-x^2)+240(x-x^2)^2 +160(x-x^2)^3
64-192x-192x^2+240(x^2-2x^3)+160x^3 ignoring all powers of x higher than x^3
=64+192x+48x^2-320x^3

--- End quote ---

ok thankyou!!!! :D ;)

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