Question

Determinati xER pentru care:
(3×+4)^2=(2×+1)^2=

^ Inseamana la puterea....

Answer 1

$(3x+4)^{2} =(2x+1)^{2}$
$(3x+4)^{2}- (2x+1)^{2} =0$
$(3x+4+2x+1)(3x+4-2x-1)=0$
$(5x+5)(x+3)=0$
$(x+1)(x+3)=0$
Deci x+1=0 => x =-1
sau x+3=0 => x=-3
Deci x∈{-3,-1}