Claire99 Claire99

20-10-2014
Mathematics

Answered

What multiplies to make -10 and adds to make 11?

Verified Answer :

cjbuckleyuk cjbuckleyuk

20-10-2014

\(xy=-10\)
\(x+y=11\)
Rearrange and substitute
\(y=11-x\)
\(x(11-x)=-10\)
\(-x^{2} +11x+10=0\)
\((-x+10)(x-1)\)
\(x=1or,x=-10\)
substitute 1 and -10 in for x to find y

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