Maths-
General
Easy

Question

How can you use polynomial identities to factor polynomials and simplify numerical expressions ?
x cubed minus 216

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:
    open parentheses a cubed minus b cubed close parentheses 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 numbers, variables or multiples of both.
    We are asked to explain on how the polynomial identities can be used to factorize polynomials and simplify them.
    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 using identities, which would speed up the process and make it simple.
    Here, the given expression is x cubed minus 216 , which can be written as: x cubed minus 6 cubed .
    Step 2 of 2:
    Apply the polynomial identity open parentheses a cubed minus b cubed close parentheses equals left parenthesis a minus b right parenthesis open parentheses a squared plus a b plus b squared close parentheses to factorize the expression x cubed minus 216 :
    x cubed minus 6 cubed equals left parenthesis x minus 6 right parenthesis open parentheses x squared plus 6 x plus 6 squared close parentheses
    equals left parenthesis x minus 6 right parenthesis open parentheses x squared plus 6 x plus 36 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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