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x₁+x₂ = -b/a = 3
x₁.x₂ = c/a = -2
x₁ = 2x₁+1
x₂ = 2x₂+1
x₁+x₂ = 2x₁+1+2x₂+1
= 2 (x₁+x₂) + 2
= 2.3 + 2
= 8
x₁.x₂ = (2x₁+1)(2x₂+1)
= 2(x₁.x₂)+2(x₁+x₂)+1
= 2.-2+2.3+1
= 3
x²-8x+3=0