Question

tìm x

a) x+5x²=0

b) x+1=(x+1)²

c)x³+x=0

Answer 1

a) \(x+5x^2=0\)

\(\Leftrightarrow x\left(1+5x\right)=0\)

\(\Leftrightarrow\left[\begin{array}{nghiempt}x=0\\x=-\frac{1}{5}\end{array}\right.\)

b) \(x+1=\left(x+1\right)^2\)

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

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

\(\Leftrightarrow\left[\begin{array}{nghiempt}x=-1\\x=0\end{array}\right.\)

c) \(x^3+x=0\)

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

\(\Leftrightarrow x=0\)

Answer 2

các bạn giải hộ mik với mình đang cần gấp

 

Answer 3

a, x= 0 hoặc -5

b, x=1 hoặc x = 0

c, x= 0