Question

Tìm x biet.

a)x mu 2 -5=0

b)(2x-1)mu 2-(3x+1)mu 2=0

c)4 phần 9×x mũ 2=-4x-9

Answer 1

a) \(x^2-5=0\)

\(\Leftrightarrow x^2=5\)

\(\Leftrightarrow\left[\begin{array}{nghiempt}x=5\\x=-5\end{array}\right.\)

b) \(\left(2x-1\right)^2-\left(3x+1\right)^2=0\)

\(\Leftrightarrow\left(2x-1+3x+1\right)\left(2x-1-3x-1\right)=0\)

\(\Leftrightarrow5x\left(-x-2\right)=0\)

\(\Leftrightarrow\left[\begin{array}{nghiempt}x=0\\-x-2=0\end{array}\right.\)\(\Leftrightarrow\left[\begin{array}{nghiempt}x=0\\x=-2\end{array}\right.\)

c) \(\frac{4}{9}\cdot x^2=-4x-9\)

\(\Leftrightarrow\left(\frac{2}{3}x\right)^2+4x+9=0\)

\(\Leftrightarrow\left(\frac{2}{3}x+3\right)^2=0\)

\(\Leftrightarrow\)\(\frac{2}{3}x+3=0\Leftrightarrow x=-\frac{9}{2}\)