Maths-
General
Easy

Question

Use the binomial theorem to expand the expressions:
left parenthesis b minus 0.5 right parenthesis to the power of 4

The correct answer is: Thus, the expansion of the expression is (b - 0.5)^4 = b^4 - 2b^3 + 1.5b^2 - 0.5b + 0.0625


    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, .
    We are asked to find the expansion of  left parenthesis b minus 0.5 right parenthesis to the power of 4 using Binomial theorem.
    Step 1 of 2:
    The given expression is left parenthesis b minus 0.5 right parenthesis to the power of 4.text  The value of  end text straight n equals 4 text , so the number of terms in the expansion would be  end text 4 plus 1 equals 5 text  terms. The value of  end text x equals b straight & y equals negative 0.5 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 b minus 0.5 right parenthesis to the power of 4 equals 4 C subscript 0 left parenthesis b right parenthesis to the power of 4 plus 4 C subscript 1 left parenthesis b right parenthesis cubed left parenthesis negative 0.5 right parenthesis plus 4 C subscript 2 left parenthesis b right parenthesis squared left parenthesis negative 0.5 right parenthesis squared plus 4 C subscript 3 left parenthesis b right parenthesis to the power of 1 left parenthesis negative 0.5 right parenthesis cubed plus 4 C subscript 4 left parenthesis negative 0.5 right parenthesis to the power of 4 end cell row cell equals b to the power of 4 plus 4 left parenthesis b right parenthesis cubed left parenthesis negative 0.5 right parenthesis plus 6 left parenthesis b right parenthesis squared left parenthesis 0.25 right parenthesis plus 4 b left parenthesis negative 0.125 right parenthesis plus left parenthesis 0.0625 right parenthesis 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 b to the power of 4 minus 2 b cubed plus 1.5 b squared minus 0.5 b plus 0.0625 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
    Thus, the expansion of the expression is left parenthesis b minus 0.5 right parenthesis to the power of 4 equals b to the power of 4 minus 2 b cubed plus 1.5 b squared minus 0.5 b plus 0.0625
    Note:
    The expansion of  (x+y)n can be also found using the Pascal’s triangle using the (n+1)th row of the triangle.

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