Maths-
General
Easy

Question

Use the binomial theorem to expand the expressions:
left parenthesis d minus 3 right parenthesis to the power of 4

The correct answer is: The required expansion is (d-3)^4=d^4-12d^3+54d^2-108d+81


    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 left parenthesis d minus 3 right parenthesis to the power of 4 using Binomial theorem.
    Step 1 of 2:
    The given expression isleft parenthesis d minus 3 right parenthesis to the power of 4. Here, the value of n = 4, so we would have 4+1 = 5 terms in the expansion. The value of x equals d straight & y equals negative 3
    Step 2 of 2:
    Substitute the values in the binomial equation and hence find the expansion;
    space 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 space space left parenthesis d minus 3 right parenthesis to the power of 4 equals 4 C subscript 0 left parenthesis d right parenthesis to the power of 4 plus 4 C subscript 1 left parenthesis d right parenthesis cubed left parenthesis negative 3 right parenthesis plus 4 C subscript 2 open parentheses d squared close parentheses left parenthesis negative 3 right parenthesis squared plus 4 C subscript 3 left parenthesis d right parenthesis left parenthesis negative 3 right parenthesis cubed plus 4 C subscript 4 left parenthesis negative 3 right parenthesis to the power of 4 space space end cell row cell space equals d to the power of 4 plus 4 open parentheses d cubed close parentheses left parenthesis negative 3 right parenthesis plus 6 open parentheses d squared close parentheses left parenthesis 9 right parenthesis plus 4 left parenthesis d right parenthesis left parenthesis negative 27 right parenthesis plus 81 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 row cell equals d to the power of 4 minus 12 d cubed plus 54 d squared minus 108 d plus 81 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 space space space space space space space space space space space end cell end table
    text  The required expansion is  end text left parenthesis d minus 3 right parenthesis to the power of 4 equals d to the power of 4 minus 12 d cubed plus 54 d squared minus 108 d plus 81
    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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