Răspunsuri

Cel mai inteligent răspuns!
2014-09-10T18:18:21+03:00
2x²+8x-2x+11-7<0
2x²+6x+4<0| :2
x²+3x+2<0
Δ=b²-4ac
Δ= 9-8
Δ=1⇒x₁,₂=-b⁺₋√Δ /2a⇒x₁= -3+1/2=-2/2=-1
x₂=-3-1/2=-4/2=-2

Sper sa nu fi gresit vreo formula

2 5 2
2014-09-10T18:23:23+03:00
2x+7>2x²+8x+11
2x²-2x-8x>-7+11
2x²+6x>4
2x²+6x-4=0
Δ=b²-4ac=36-4*2*(-4)=36+32=>Δ=4
nu sunt sigur dar cred ca e bine
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