Maths-
General
Easy

Question

Use the binomial theorem to expand the expressions:
left parenthesis x plus 3 right parenthesis cubed

The correct answer is: Thus, the expansion of the expression is (x + 3)^3 = x^3 + 9x^2 + 27x + 27


    ANSWER:
    Hint:
    The binomial expansion is left 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 comma text  here  end text n greater or equal than 0 , here .
    We are asked to find the expansion of  left parenthesis x plus 3 right parenthesis cubedusing Binomial theorem.
    Step 1 of 2:
    The given expression is left parenthesis x plus 3 right parenthesis cubed text . Here,  end text straight n equals 3 text . So, we would have  end text 3 plus 1 equals 4 text  terms in the expansion.  end text
    text  The value of  end text x equals x straight & y equals 3 text .  end text
    Step 2 of 2:
    Substitute the values in the binomial equation to get the expansion:
    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 left parenthesis x plus 3 right parenthesis cubed equals 3 C subscript 0 x cubed plus 3 C subscript 1 left parenthesis x right parenthesis squared left parenthesis 3 right parenthesis plus 3 C subscript 2 left parenthesis x right parenthesis left parenthesis 3 right parenthesis squared plus 3 C subscript 3 left parenthesis 3 right parenthesis cubed end cell row cell equals x cubed plus 3 left parenthesis x right parenthesis squared left parenthesis 3 right parenthesis plus 3 left parenthesis x right parenthesis left parenthesis 9 right parenthesis plus 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 end cell row cell equals x cubed plus 9 x squared plus 27 x plus 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 end cell end table
    Thus, the expansion of the expression is  left parenthesis straight x plus 3 right parenthesis cubed equals straight x cubed plus 9 straight x squared plus 27 straight x plus 27
    Note:
    The answer can also be found using the Pascal’s triangle (using the fourth row).

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