document.write( "Question 1148137: If f(x) = 7^x, then what does f(x+3)-f(x+1) equal? \n" ); document.write( "

Algebra.Com's Answer #769500 by ikleyn(52788) $\"\"$ $\"About$

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document.write( "it is equal to   -  =  =  =  =  = .    ANSWER\r\n" );
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