Question

rezolvati in R ecuatiia:
√(1-3x)la puterea a 2=7

Answer 1

$\sqrt{ (1-3x)^{2} }=7 \\ 1-3x=7 \\ 3x=1-7 \\ 3x=-6 \\ x= -\frac{6}{3}$
x=-2∈R
R/S:S={-2}