19-03-2015
Mathematics

contestada

what two numbers multiply to -105 and add to 8

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Аноним Аноним

19-03-2015

a b=-105
a+b=8
x²+8x-105=0

x²+-7x+15x-105=0
x(x-7)+15(x-7)=0
(x-7)(x+15)=0
a=-7
b=15

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