Question

/x-5/=0

/3x-9/=0

(x+7).(4x-16)=0

(x+5).(x+10)=0

Answer 1

a, |x-5|=0

=>x-5=0

=>x=5

b, |3x-9|=0

=>3x-9=0

=>3x=9

=>x=3

c,(x+7)(4x-16)=0

=>\(\orbr{\begin{cases}x+7=0\\4x-16=0\end{cases}\Rightarrow\orbr{\begin{cases}x=-7\\x=4\end{cases}}}\)

Vậy x = -7 hoặc x = 4

d, (x+5)(x+10)=0

=>\(\orbr{\begin{cases}x+5=0\\x+10=0\end{cases}\Rightarrow\orbr{\begin{cases}x=-5\\x=-10\end{cases}}}\)