Question

[Nguyễn Hoài An]

 giải giúp bài 12 tìm x với ạ

Answer 1

[Lấp La Lấp Lánh]

a) \(x\left(2-x\right)+\left(x+3\right)^2=9\)

\(\Leftrightarrow-x^2+2x+x^2+6x+9=9\)

\(\Leftrightarrow8x=0\Leftrightarrow x=0\)

b) \(\Leftrightarrow x^2-8x+16-x^2+2x+3=-5\)

\(\Leftrightarrow-6x=-24\Leftrightarrow x=4\)

c) \(\Leftrightarrow\left(x-3\right)^2=0\)

\(\Leftrightarrow x-3=0\Leftrightarrow x=3\)

d) \(\Leftrightarrow\left(3x-2\right)^2=0\)

\(\Leftrightarrow3x-2=0\Leftrightarrow x=\dfrac{2}{3}\)

e) \(\Leftrightarrow\left(x-9-2x\right)\left(x-9+2x\right)=0\)

\(\Leftrightarrow-3\left(x+9\right)\left(x-3\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x=-9\\x=3\end{matrix}\right.\)

f) \(\Leftrightarrow\left(5x-3-3x+5\right)\left(5x-3+3x-5\right)=0\)

\(\Leftrightarrow16\left(x+1\right)\left(x-1\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x=1\\x=-1\end{matrix}\right.\)

Answer 2

[Nguyễn Hoài An]

giải giúp tớ luôn bài 10 với ạ