Toán Lớp 8: 3x( x-14)+(4x-14)=0
Giúp mik vs cảm ơn trướn nhe
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Toán Lớp 8: 3x( x-14)+(4x-14)=0
Giúp mik vs cảm ơn trướn nhe
Comments ( 2 )
Giải đáp:
$3x.(x-14)+4.(x-14)=0$
$⇔ (3x+4).(x-14)=0$
$⇔$ \(\left[ \begin{array}{l}3x+4=0\\x-14=0\end{array} \right.\) $⇔$ \(\left[ \begin{array}{l}3x=-4\\x=14\end{array} \right.\) $⇔$ \(\left[ \begin{array}{l}x=\dfrac{-4}{3}\\x=14\end{array} \right.\)
$\text{Vậy x ∈ {-4/3;14}}$
3x(x-14)+4(x-14)=0
⇔(x-14)(3x+4)=0
⇔\(\left[ \begin{array}{l}x-14=0\\3x+4=0\end{array} \right.\)
⇔\(\left[ \begin{array}{l}x=14\\3x=-4\end{array} \right.\)
⇔\(\left[ \begin{array}{l}x=14\\x=\frac{-4}{3}\end{array} \right.\)
Vậy x={\frac{-4}{3};14}