Номер 590 а б в.,..............

Question

Номер 590 а б в.,..............

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Answer 1

A)y^2=y
б)x^2=-5x-6
   x^2+5x-6=0
   D=5^2-4x1x(-6)=25+24=49
   x1=-b+D/2=-5+7/2=1
   x2=-b-D/2=-5-7/2=-6