Question

9:(x+2) mũ 2 +9=9,25. Đây là bài tìm x nha

giúp mik với mik đang cần gấp.

Answer 1

9:(x+2)²+9=9,25

⇒9:(x+2)²+9=9,25

⇒9:(x+2)²+9=9,25

⇒9:(x+2)²=0,25

⇒(x+2)²=36

⇒hoặc x+2=√36⇒x+2=6⇒x=4

           x+2=-√36⇒x+2=-6⇒x=-8

vậy x={4;-8}

Answer 2

Ta có: \(\dfrac{9}{\left(x+2\right)^2}+9=9.25\)

\(\Leftrightarrow\dfrac{9}{\left(x+2\right)^2}=0.25\)

\(\Leftrightarrow\left(x+2\right)^2=36\)

\(\Leftrightarrow\left[{}\begin{matrix}x+2=6\\x+2=-6\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=4\\x=-8\end{matrix}\right.\)