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Easy

Question

Use polynomial identities to factor each polynomial : open parentheses 8 x to the power of 6 minus y cubed close parentheses

hintHint:

a cubed minus b cubed equals left parenthesis a minus b right parenthesis open parentheses a squared plus a b plus b squared close parentheses , where a and b can be real values, variables or multiples of both. We are asked to use polynomial identities to factor the given polynomial.

The correct answer is: polynomial identities


    Step 1 of 2:
    The given expression is open parentheses 8 x to the power of 6 minus y cubed close parentheses . It can be written as open parentheses 2 x squared close parentheses cubed minus y cubed . This is of the form a3 - b3 where a equals 2 x squared straight & b equals y.
    Step 2 of 2:
    Substitute the values in the expansion to get the factor form. Thus, we have:

    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 open parentheses 8 x to the power of 6 minus y cubed close parentheses equals open parentheses 2 x squared close parentheses cubed minus y cubed end cell row cell equals open parentheses 2 x squared minus y close parentheses open parentheses open parentheses 2 x squared close parentheses squared plus open parentheses 2 x squared close parentheses left parenthesis y right parenthesis plus left parenthesis y right parenthesis squared close end cell row cell equals open parentheses 2 x squared minus y close parentheses open parentheses 4 x to the power of 4 plus 2 y x squared plus y squared close parentheses end cell end table
    Hence, the factor is: open parentheses 8 x to the power of 6 minus y cubed close parentheses equals open parentheses 2 x squared minus y close parentheses open parentheses 4 x to the power of 4 plus 2 y x squared plus y squared close parentheses .

    We use identities to speed up the process of multiplication and simplification. There are some basic polynomial identities that you need to by heart.

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