lisa70 lisa70
  • 23-03-2016
  • Mathematics
contestada

A+B= -7 and AXB= -15

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Аноним Аноним
  • 24-03-2016
a+b=-7
ab=-15

a=-7-b
b(-7-b)=-15

a=-7-b
-b^2-7b+15=0

a=-7-b
b^2+7b-15=0

a=-7-b
b=(-7±sqrt(109))/2
1) 
a=-7-b
b=(-7+sqrt(109))/2

b=(-7+sqrt(109))/2
a=-7+3.5-sqrt(109)/2

b=(-7+sqrt(109))/2
a=-3.5-sqrt(109)/2

2)
a=-7-b
b=(-7-sqrt(109))/2

b=(-7-sqrt(109))/2
a=-7+3.5+sqrt(109)/2

b=(-7-sqrt(109))/2
a=-3.5+sqrt(109)/2
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