Maths-
General
Easy

Question

Use the binomial theorem to expand the expressions:
open parentheses 2 x plus 1 third close parentheses cubed

The correct answer is: Thus, the expansion is: (2x + 1/3 )^3 = 8x^3 + 4x^2 + 2x/3 + 1/27


    ANSWER:
    Hint:
    The binomial expansion isleft parenthesis x plus y right parenthesis to the power of n equals sum from k equals 0 to n of   n C subscript k x to the power of n minus k end exponent y to the power of k text , here  end text n greater or equal than 0 ,
    We are asked to find the expansion of  open parentheses 2 x plus 1 third close parentheses cubed using Binomial theorem
    Step 1 of 2:
    The given expression is open parentheses 2 x plus 1 third close parentheses cubed.  Here, n=3, so we would have 3+1=4 terms in the expansion of the expression. The value ofx equals 2 x straight & y equals 1 third.
    Step 2 of 2:
    Substitute the values in the binomial equation to get the expansion of the expression;
    table attributes columnalign right left right left right left right left right left right left columnspacing 0em 2em 0em 2em 0em 2em 0em 2em 0em 2em 0em end attributes row cell open parentheses 2 x plus 1 third close parentheses cubed equals 3 C subscript 0 left parenthesis 2 x right parenthesis cubed plus 3 C subscript 1 left parenthesis 2 x right parenthesis squared open parentheses 1 third close parentheses plus 3 C subscript 2 left parenthesis 2 x right parenthesis open parentheses 1 third close parentheses squared plus 3 C subscript 3 open parentheses 1 third close parentheses cubed end cell row cell equals 8 x cubed plus 3 open parentheses 4 x squared close parentheses open parentheses 1 third close parentheses plus 3 left parenthesis 2 x right parenthesis open parentheses 1 over 9 close parentheses plus 1 over 27 space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space end cell row cell equals 8 x cubed plus 4 x squared plus fraction numerator 2 x over denominator 3 end fraction plus 1 over 27 space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space end cell end table
    Thus, the expansion is: open parentheses 2 x plus 1 third close parentheses cubed equals 8 x cubed plus 4 x squared plus fraction numerator 2 x over denominator 3 end fraction plus 1 over 27
    Note:
    The answer can also be found using the Pascal’s triangle. For the expansion of the expression (x+y)n ,
    we would consider the (n+1)th row in the triangle.

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