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Easy

Question

Emma factored open parentheses 625 g to the power of 16 minus 25 h to the power of 4 close parentheses Describe and correct the error Emma made in factoring the polynomial.

hintHint:

Let a & b be real values and n & m be integers. 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 a to the power of m close parentheses to the power of n equals a to the power of m n end exponent end cell row cell left parenthesis a minus b right parenthesis left parenthesis a plus b right parenthesis equals a squared minus b squared. end cell end table
We are asked to describe and correct the error that Emma has made in factoring the polynomial

The correct answer is: (25 g8)2 .


     Step 1 of 2:
    The given expression is open parentheses 625 g to the power of 16 minus 25 h to the power of 4 close parentheses . It can be written as open parentheses 25 g to the power of 8 close parentheses squared minus open parentheses 5 h squared close parentheses squared . It is of the form a squared minus b squared .
    Substitute the values in the expression and factorize it,

    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 625 g to the power of 16 minus 25 h to the power of 4 close parentheses equals open parentheses 25 g to the power of 8 close parentheses squared minus open parentheses 5 h squared close parentheses squared end cell row cell equals open parentheses 25 g to the power of 8 minus 5 h squared close parentheses open parentheses 25 g to the power of 8 plus 5 h squared close parentheses end cell end table
    Step 2 of 2:
    The error that Emma had made was writing 625 g to the power of 16 text  as  end text open parentheses 25 g to the power of 4 close parentheses squared . This is not how law of exponents work. The correct for is open parentheses 25 g to the power of 8 close parentheses squared .
     

    It is important to recall the law of exponents while to expand polynomial expressions.

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