Maths-
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Easy

Question

Use Pascal triangle to expand the expression left parenthesis a minus b right parenthesis to the power of 6.

The correct answer is: Thus, the expansion is


    ANSWER:
    Hint:
    Pascal's Triangle is a method to know the binomial coefficients of terms of binomial expression (x + y)n, where n can be any positive integer and x,y are real numbers. Pascal Triangle is represented in a triangular form, it is kind of a number pattern in the form of a triangular arrangement.
    We are asked to find the expansion of the expression left parenthesis a minus b right parenthesis to the power of 6 using Pascal’s triangle.
    Step 1 of 2:
    The given expression isleft parenthesis a minus b right parenthesis to the power of 6 . Here, the value of n=6. Thus, there would be 6+1=7 terms.
    Hence, we should use the seventh row of the Pascal’s triangle to write the corresponding expansion.
    Step 2 of 2:


    Analyzing the figure, the expansion of the expression left parenthesis a minus b right parenthesis to the power of 6 is:
    left parenthesis a minus b right parenthesis to the power of 6 equals a to the power of 6 plus 6 left parenthesis a right parenthesis to the power of 5 left parenthesis negative b right parenthesis plus 15 left parenthesis a right parenthesis to the power of 4 left parenthesis negative b right parenthesis squared plus 20 left parenthesis a right parenthesis cubed left parenthesis negative b right parenthesis cubed plus 15 left parenthesis a right parenthesis squared left parenthesis negative b right parenthesis to the power of 4 plus 6 left parenthesis a right parenthesis left parenthesis negative b right parenthesis to the power of 5 plus left parenthesis negative b right parenthesis to the power of 6
    equals a to the power of 6 minus 6 a to the power of 5 b plus 15 a to the power of 4 b squared minus 20 a cubed b cubed plus 15 a squared b to the power of 4 minus 6 a b to the power of 5 plus b to the power of 6
    Thus, the expansion isleft parenthesis a minus b right parenthesis to the power of 6 equals a to the power of 6 minus 6 a to the power of 5 b plus 15 a to the power of 4 b squared minus 20 a cubed b cubed plus 15 a squared b to the power of 4 minus 6 a b to the power of 5 plus b to the power of 6
    Note:
    The answer can be found using the binomial expansion of 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 where n greater or equal than 0 .

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