a) 2x + 3 = 4 b) 4x + 4 = 0 c) 5x = 0 d) ( x + 1 )( x + 2 ) = 0

a) 2x + 3 = 4

⇒ 2x= 1

$\text{⇒ 1 : 2}$

$\text{⇒ $\frac{1}{2}$ }$

$\text{b) 4x + 4 = 0}$

$\text{⇒ 4x= -4}$

$\text{⇒ x= -1}$

$\text{c) 5x = 0}$

$\text{⇒ x= 0 : 5}$

$\text{⇒ x= 0}$

$\text{d) ( x + 1 )( x + 2 ) = 0}$

$\text{⇒ \(\left[ \begin{array}{l}x= x+1=0\\x=x+2=0\end{array} \right.\) }$

$\text{⇒\(\left[ \begin{array}{l}x=-1\\x=-2\end{array} \right.\) }$

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