Question

O stie cineva ? Multumesc anticipat!

Answer 1

x=10
deoarece
mutam x in partea opusa si se duce cu + si adunam 
4x+2+4
x=10

Answer 2

$(x+1)^{2}=(3x+1)^{2} \\ \\ x^{2} +2x+1=(3x)^{2} +2*3x+1 \\ \\ (x^{2}+2x)=9 x^{2} +6x \\ \\9 x^{2}- x^{2} +2x-6x=0 \\ \\ -8x^{2}-4x=0 :x\\ \\ x1=0; \\ \\ (-8x-4=0 ):4\\ \\ -2x-1=0 \\ \\ x=- \frac{1}{2}$[
x₁=0  si x₂=-1/2  deci x∈{0, (-1/2)