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a fost răspuns

Rezolva in Z
a)x+2=2x-1
b)(x+2) (3x-8)=3x(x-5)-7
c)2x la a 2-5x+2=0

Răspuns :

x+2=2x-1
x-2x=-1-2
-x=-3
x=3

(x+2)(3x-8)=3x(x-5)-7
3x²-8x+6x-16=3x²-15x-7
-8x+6x-16=-15x-7
-2x-16=-15x-7
-2x+15x=-7+16
13x=9
x=9/13

2x²-5x+2=0
x=-(-5)+-√(-5)²-4*2*2/2*2
x=5+-√25-16/4
x=5+-√9/4
x=5+-3/4

x₁=5+3/4
x₂=5-3/4

x₁=2
x₂=1/2




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