Question

Rezolvati in R:
√(2x+3)²=11

Answer 1

=> 2x+3=11 sau 2x+3=-11 si de aici e simplu iti va da ca x=4 sau x=-7

Answer 2

$\displaystyle \sqrt{(2x+3)^2} =11 \\ |2x+3|=11 \\ 2x+3=11 \\ 2x=11-3 \\ 2x=8 \\ x= \frac{8}{2} \\ x=4 \\ 2x+3=-11 \\ 2x=-11-3 \\ 2x=-14 \\ x=- \frac{14}{2} \\ x=-7 \\ S=\{-7;4\}$