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toate trei, va rog. Sunt ecuatii de gradul doi​

Toate Trei Va Rog Sunt Ecuatii De Gradul Doi class=

Răspuns :

a) 3x^2-3x+4x-4=0=>3x^2+x-4=0

Delta=b^2-4ac=>Delta=1-4×3×(-4)=>Delta=1+48=>Delta=49

X1=(-b+ rad.din delta)/2a=>X1=(-1+7)/6=>x1=6/6=>x1=1

x2=(-b-rad.din delta)/2a=>x2=(-1-7)/6=>x2=-6/6=>x2=-1

b)x^2-4=3x=>x^2-3x-4=0=>delta=9-4×1×(-4)=>delta=9+16=25

X1=(3+5)/2=>x1=8/2=>x1=4

X2=(3-5)/2=>x2=-2/2=>x2=-1