document.write( "Question 197770: f(x)= 5x+4; find f(-1) \n" ); document.write( "
Algebra.Com's Answer #148287 by nabla(475)\"\" \"About 
You can put this solution on YOUR website!
We want to substitute -1 for x, that is x=-1...\r
\n" ); document.write( "\n" ); document.write( "f(-1)=5(-1)+4=-5+4=-1
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