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Expand left parenthesis 3 x plus 4 y right parenthesis cubed using binomial theorem.

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 text , here  end text n greater or equal than 0 .
We are asked to find the binomial expansion of left parenthesis 3 x plus 4 y right parenthesis cubed using binomial theorem.

The correct answer is: Pascal’s triangle



    Step 1 of 2:
    The given expression is left parenthesis 3 x plus 4 y right parenthesis cubed text . Here  end text x equals 3 x straight & y equals 4 y . The value of n=3. Thus, the number of terms would be n+1=3+1=4.
    Step 2 of 2:
    Substitute the values in the expression to get the terms of the binomial 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 3 x plus 4 y right parenthesis cubed equals 3 C subscript 0 left parenthesis 3 x right parenthesis cubed plus 3 C subscript 1 left parenthesis 3 x right parenthesis squared left parenthesis 4 y right parenthesis plus 3 C subscript 2 left parenthesis 3 x right parenthesis left parenthesis 4 y right parenthesis squared plus 3 C subscript 3 left parenthesis 4 y right parenthesis cubed end cell row cell equals 1 open parentheses 27 x cubed close parentheses plus 3 open parentheses 9 x squared close parentheses left parenthesis 4 y right parenthesis plus 3 left parenthesis 3 x right parenthesis open parentheses 16 y squared close parentheses plus 1 open parentheses 64 y cubed close parentheses end cell row cell equals 27 x cubed plus 108 x squared y plus 144 x y squared plus 64 y cubed end cell end table
    Thus, the expansion is: left parenthesis 3 x plus 4 y right parenthesis cubed equals 27 x cubed plus 108 x squared y plus 144 x y squared plus 64 y.

    The answer can be found using the Pascal’s triangle. For left parenthesis x plus y right parenthesis to the power of n , we would consider the (n+1)th row as the coefficients.

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