document.write( "Question 141204: When factoring the following by the reverse FOIL method, the factors of 6 must add up to what value?\r
\n" ); document.write( "\n" ); document.write( "I have no clue as to where to begin.\r
\n" ); document.write( "\n" ); document.write( "f(x) = x^2 + 5x + 6\r
\n" ); document.write( "\n" ); document.write( "a. 1
\n" ); document.write( "b. 1+6+5=12
\n" ); document.write( "c. 6
\n" ); document.write( "d. 5
\n" ); document.write( "

Algebra.Com's Answer #102859 by nabla(475)\"\" \"About 
You can put this solution on YOUR website!
Consider the following:\r
\n" ); document.write( "\n" ); document.write( "(1)f(x)=(x+1)(x+2)
\n" ); document.write( "expand it:
\n" ); document.write( "(2)f(x)=x^2+2x+1x+2
\n" ); document.write( "(3)f(x)=x^2+3x+2\r
\n" ); document.write( "\n" ); document.write( "Similar to the problem you proposed, we could ask \"the factors of 2 must add up to what value?\" What are the factors of 2? They add up to what? From (2) above, we see that 2 and 1 are the coefficients of individual x terms from the expansion. Thus, to address your problem we need to find out the factors of 6 that add up to 5. It is the same process.\r
\n" ); document.write( "\n" ); document.write( "Your problem factors as f(x)=(x+3)(x+2). It should be evident by now that the correct answer is d.5.
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