Question

(3x+5)^2=9

Giusp mik với mik cần gấp ạ

Answer 1

\(\Leftrightarrow\left(3x+5\right)^2=3^2=\left(-3\right)^2\\ \Leftrightarrow\left[{}\begin{matrix}3x+5=3\\3x+5=-3\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}3x=-2\\3x=-8\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=-\dfrac{2}{3}\\x=-\dfrac{8}{3}\end{matrix}\right.\)

Answer 2

(3x + 5)² = 9

(3x + 5)² = 3²

3x + 5 = 3

3x = 3 - 5

3x = -2

x = -2 : 3

X = \(\dfrac{-2}{3}\)