\(\left|x^2+8\right|=9\Leftrightarrow x^2+8=\left|9\right|\)
\(\Leftrightarrow\left[{}\begin{matrix}x^2+8=9\Leftrightarrow x^2=1\Leftrightarrow x=\pm1\\x^2+8=-9\Leftrightarrow x^2=-17\Rightarrow x=\varnothing\end{matrix}\right.\) Vì \(x^2\ge0\) với mọi x
➤\(x=\pm1\)
\(\left(6\right)\dfrac{3\sqrt{x}}{5\sqrt{x}-1}\le-3\)
\(\left(7\right)\dfrac{8\sqrt{x}+8}{6\sqrt{x}+9}>\dfrac{8}{3}\)
\(\left(8\right)\dfrac{\sqrt{x}-2}{2\sqrt{x}-3}< -4\)
\(\left(9\right)\dfrac{4\sqrt{x}+6}{5\sqrt{x}+7}\le-\dfrac{2}{3}\)
\(\left(10\right)\dfrac{6\sqrt{x}-2}{7\sqrt{x}-1}>-6\)
Giải phương trình: \(x^2+8x+9=\) \(\left(x+8\right)\)\(\sqrt{x^2+9}\)
giải ptvt:
căn (x^2-4x+5)+căn( x^2-4x+8)+căn (x^2-4x+9)= 3+căn 5
căn (2-x^2+2x)+căn(-x^2-6x-8)=1+căn 3
căn (9x^2-6x+2)+căn(45x^2-30x+9)=căn(6x-9x^2+8)
giải ptvt:
căn (x^2-4x+5)+căn( x^2-4x+8)+căn (x^2-4x+9)= 3+căn 5
căn (2-x^2+2x)+căn(-x^2-6x-8)=1+căn 3
căn (9x^2-6x+2)+căn(45x^2-30x+9)=căn(6x-9x^2+8)
Giải pt sau với \(\alpha\)là tham số ; x là ẩn
\(\alpha\frac{9x^8+84x^6+126x^4+36x^2+1}{x^8+36x^6+126x^4+84x^2+9}+x\frac{9\alpha^8+84\alpha^6+126\alpha^4+36\alpha^2+1}{\alpha^8+36\alpha^6+126\alpha^4+84\alpha^2+9}=0\)
Giải phương trình:
`c) x^2 - 6. sqrt(x^2 +5) + x = 2.sqrt(x-1) - 14`
`d) x^2 - sqrt((x^2-8).(x-2)) +x = sqrt(x^2 - 8) + sqrt(x-2) +9`
\(\sqrt{\left(2x+3\right)^2}=5\)
\(\sqrt{9.\left(x-2\right)^2}=18\)
\(\sqrt{9x-18}-\sqrt{4x-8}+3\sqrt{x-2}=40\)
\(\sqrt{4.\left(x-3\right)^2}=8\)
\(\sqrt{4x^2+12x+9}=5\)
\(\sqrt{5x-6}-3=0\)
Giải phương trình \(x^2+x-9=\sqrt{x^2-8}+\sqrt{x-2}+\sqrt{\left(x^2-8\right)\left(x-2\right)}\)
6) \(\sqrt{x^2+12x+36}=-x-6\)
7) \(\sqrt{9x^2-12x+4}=3x-2\)
8) \(\sqrt{16-24x+9x^2}=2x-10\)
9) \(\sqrt{x^2-6x+9}==2x-3\)
10) \(\sqrt{x^2-3x+\dfrac{9}{4}}=\dfrac{3}{x}x-4\)
A)\(\sqrt{x^2-4x+5}+\sqrt{x^2-4x+8}+\sqrt{x^2-4x+9}=3+\sqrt{5}\)
B)\(\sqrt{9x^2-6x+2}+\sqrt{45x^2-30x+9}=\sqrt{6x-9x^2+8}\)
