Răspunsuri

2014-04-24T09:33:25+03:00
(x-2)^2-7=2
x^2=2+7
x^2-4x+4=9
x^2-4x+4-9=0
x^2-4x-5=0
Delta=b^2-4ac
Delta=16-4*1*(-5)
Delta=16+20
Delta=36
Radical delta=6

x1=-b-rad delta/2a
x1=-(-4)-6/2
x1=4-6/2
x1=-2/2
x1=-1

x2=-b+rad delta/2a
x2=-(-4)+6/2
x2=4+6/2
x2=10/2
x2=5

x²-4=9 x²=13
nu e x^2-2^2=9!!!!
(x-2)²=x²-4x+4 ( e cu formula aia)
asa e
doh!!!!
2014-04-24T09:34:00+03:00
(x-2)²-7=2 x-2²-7=2 x-4-7=2 x-4=7+2 x-4=9 x=9+4 x=13
pune mana si corecteaza
Dar asta se învață numai la liceu !!!
in gimnaziu se invata chestii astea!
daca tu nu le stii asta nu e pb mea
(x-2)²=x²-4x+4 (ata e formula)