Question

Rezolva
Dau 100 puncte + coroană !!
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Answer 1

Explicație pas cu pas:

a) 2x+6<_ 0 => 2x<_ -6 => x<_ -3 => x€ (- infinit,-3]

6y-42<_0 => 6y<_ 42 => y<_ 7 => y € (- infinit,7]

c) x^2+5x<_0

delta = 25. x1=0/2 - imposibil

x2=-10/2= -5 => x€(- infinit,-5]

y^2-y<_ 0

delta=1. y1=2/2=1

y2=0/2 - imposibil

=> y€(-infinit,1]

d)x+2<_ 1 => x<_ -1 => x €(- infinit,-1]

y-7<_ 1 => y<_ 8. => x€ (- infinit,8]