Question

Va rog rezolvați exercițile astea am mare nevoie !!
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Answer 1

Răspuns:

1)a)x=5 b)x1=4,x2=1 c)?

Explicație pas cu pas:

1)a)2(x-1)=x+3    

2x-2=x+3

2x-x=3+2

x=5

b)x²-5x+4=0

Δ=(-5)²-4×1×4=25-16=9

x1=$\frac{-(-5)+\sqrt{9} }{2*1}$=$\frac{8}{2}$=4

x2=$\frac{-(-5)-\sqrt{9} }{2*1}$=$\frac{2}{2}$=1

c)-2x²+8=0

?

Answer 2

1)a)2(x-1)=x+3

2x-2=x+3

2x-x=3+2

x=5

b)x²-5x+4=0

Δ=(-5)²-4×1×4=25-16=9

x1=\frac{-(-5)+\sqrt{9} }{2*1}=\frac{8}{2}=4

x2=\frac{-(-5)-\sqrt{9} }{2*1}=\frac{2}{2}=1

c)-2x²+8=0/+2

=-x=8+2

=-x=10