Question

a.2x+5=x+2
b.5(3x-2)=2x+5(3x-1)
c.x²-6x+9=0
d.x²+4x+4=0
vă rog frumos un raspuns multumesc.

Answer 1

a)2x+5=x+2
2x-x+5=2
2×-x=2-5
x=2-5
x=-3
b)5(3x-2)=2x+5(3x-1)
15x-10=2x+15x-5
-10=2x-5
-2x=-5+10
2x=5
x=-5/2
c)(x-3)la puterea 2=0
x-3=0
x=3
d)(x+2)la puterea 2=0
x+2=0
x=-2
Sper ca te-am ajutat :)

Answer 2

a)  

2 x + 5 = x + 2

2 x - x = 2 - 5

x = - 3

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b)   5 ( 3 x - 2 ) = 2 x + 5 ( 3 x - 1 )

15 x - 10 = 2 x + 15 x - 5

15 x - 2 x - 15 x = - 5 + 10

- 2 x = 5

x = - 5 / 2 ⇒     x = - 2,5

____________________

c)    x² - 6 x + 9 = 0

Δ = 36 - 36 = 0 ⇒ x ₁= x₂ = - b / 2 a = 6 / 2 = 3

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d)   x² + 4 x + 4 = 0

Δ = 16 - 16 = 0 ⇒ x₁ = x₂ = - 4 / 2 = - 2