repede va rog. descompuneti in factori

x^2+4x+1 = (x^2 + 4x + 4) - 3 = (x+2)^2 - (√3)^2 = (x+2+√3)(x+2-√3)
am folosit formulele:
(a+b)^2 = a^2 +2ab + b^2 si
a^2 - b^2 = (a-b)(a+b)