Maths-
General
Easy

Question

Use polynomial identities to factor the polynomials or simplify the expressions :
x to the power of 8 minus 9

The correct answer is: Hence, the simplified expression is x^8 - 9 = (x^4 - 3)(x^4+3).


    ANSWER:
    Hint:
    open parentheses straight a squared minus straight b squared close parentheses equals left parenthesis straight a minus straight b right parenthesis left parenthesis straight a plus straight b right parenthesis, where a and b can be real values, variables or multiples of both.
    We are asked to simplify the given polynomial using identities.
    Step 1 of 2:
    The given expression is x to the power of 8 minus 9text  It can be written as  end text open parentheses x to the power of 4 close parentheses squared minus left parenthesis 3 right parenthesis squared text . This is of the form  end text a squared minus b squared text  where  end text a equals x to the power of 4 straight & b equals 3 text ,  end text
    Step 2 of 2:
    Use the polynomial identity to simplify the expression;
    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 x to the power of 8 minus 9 equals open parentheses x to the power of 4 close parentheses squared minus left parenthesis 3 right parenthesis squared end cell row cell equals open parentheses x to the power of 4 minus 3 close parentheses open parentheses x to the power of 4 plus 3 close parentheses space space space space end cell end table
    Hence, the simplified expression is x to the power of 8 minus 9 equals open parentheses x to the power of 4 minus 3 close parentheses open parentheses x to the power of 4 plus 3 close parentheses.
    Note:
    The multiplication of algebraic expressions is a method of multiplying two given expressions consisting of variables and constants.

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