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Question

Dakota said the third term of the expansions of left parenthesis 2 g plus 3 h right parenthesis to the power of 4 text  is  end text 36 g squared h squared .Explain Dakota’s error and then correct the answer.

hintHint:

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 , here n ≥ 0 . We are asked to describe and correct the mistake Dakota made in the expansion of the expression left parenthesis 2 g plus 3 h right parenthesis to the power of 4 .

The correct answer is: 4C2



    Step 1 of 2:
    The given expression is left parenthesis 2 g plus 3 h right parenthesis to the power of 4, here x = 2g & y = 3h.
    Thus, the expansion would be:

    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 2 g plus 3 h right parenthesis to the power of 4 equals 4 C subscript 0 left parenthesis 2 g right parenthesis to the power of 4 plus 4 C subscript 1 left parenthesis 2 g right parenthesis cubed left parenthesis 3 h right parenthesis plus 4 C subscript 2 left parenthesis 2 g right parenthesis squared left parenthesis 3 h right parenthesis squared plus 4 C subscript 3 left parenthesis 2 g right parenthesis left parenthesis 3 h right parenthesis cubed plus 4 C subscript 4 left parenthesis 3 h right parenthesis to the power of 4 end cell row cell equals 16 g to the power of 4 plus 4 open parentheses 8 g cubed close parentheses left parenthesis 3 h right parenthesis plus 6 open parentheses 4 g squared close parentheses open parentheses 9 h squared close parentheses plus 4 left parenthesis 2 g right parenthesis open parentheses 27 h cubed close parentheses plus 81 h to the power of 4 end cell row cell equals 16 g to the power of 4 plus 96 g cubed h plus 216 g squared h squared plus 216 g h cubed plus 81 h to the power of 4 end cell end table
    Step 2 of 2:
    Analyzing the expansion, find the coefficient of  g2h2. The value is: 216 Dakota got the wrong answer because she did not count the value 4C2 .

    You can use Both the Pascal’s triangle and binomial expansion to find the value of (x + y)n .

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