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Easy

Question

Explain how to use a polynomial identity to factor .8 x to the power of 6 minus 27 y cubed

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


    ANSWER:
    Hint:
    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 explain how to use a polynomial identity to factor8 x to the power of 6 minus 27 y cubed .
    Step 1 of 2:
    Factoring a polynomial is the process of decomposing a polynomial into a product of two or more polynomials. This can be done with the help of identities, which would speed up the process and make it simple.
    The given polynomial is 8 x to the power of 6 minus 27 y cubed. It can be written as: open parentheses 2 x squared close parentheses cubed minus left parenthesis 3 y right parenthesis cubed text  here  end text a equals 2 x squared straight & b equals 3 y.
    Step 2 of 2:
    Substitute the values of 8 x to the power of 6 minus 27 y cubed in the identity;
    open parentheses 2 x squared close parentheses cubed minus left parenthesis 3 y right parenthesis cubed equals open parentheses 2 x squared minus 3 y close parentheses open parentheses open parentheses 2 x squared close parentheses squared plus open parentheses 2 x squared close parentheses left parenthesis 3 y right parenthesis plus left parenthesis 3 y right parenthesis squared close
    equals open parentheses 2 x squared minus 3 y close parentheses open parentheses 4 x to the power of 4 plus 6 x squared y plus 9 y squared close parentheses
    Thus, the factor is: 8 x to the power of 6 minus 27 y cubed equals open parentheses 2 x squared minus 3 y close parentheses open parentheses 4 x to the power of 4 plus 6 x squared y plus 9 y squared close parentheses
    Note:
    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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