document.write( "Question 799080: What are factors of -12 that when added together equal to -1 \n" ); document.write( "

Algebra.Com's Answer #482497 by Finavon(81) $\"\"$ $\"About$

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factors (integers) a and b
\n" ); document.write( "a+b=-1 (1)
\n" ); document.write( "a*b=-12 (2)
\n" ); document.write( "rearrange (1) a=-(1+b)
\n" ); document.write( "subst for a in (2):
\n" ); document.write( "-(1+b)*b=-12
\n" ); document.write( " $\"+-b-b%5E2+=+-12+\"$
\n" ); document.write( "rearrange $\"b%5E2%2Bb-12=0+\"$
\n" ); document.write( "solves for $\"+%28-1+%2B-sqrt%281%2B4%2A12%29%29%2F2+\"$
\n" ); document.write( " $\"+%28-1+%2B-+7%29%2F2+=+3+or+-4\"$
\n" ); document.write( "Factors are 3 and -4 \n" ); document.write( "

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