Claire99
Claire99
20-10-2014
Mathematics
Answered
What multiplies to make -10 and adds to make 11?
Answer :
cjbuckleyuk
cjbuckleyuk
20-10-2014
[tex]xy=-10[/tex]
[tex]x+y=11[/tex]
Rearrange and substitute
[tex]y=11-x[/tex]
[tex]x(11-x)=-10[/tex]
[tex] -x^{2} +11x+10=0[/tex]
[tex](-x+10)(x-1)[/tex]
[tex]x=1or,x=-10[/tex]
substitute 1 and -10 in for x to find y
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