Solve x:5(x+3)=0 5(x+3)=0 5(x+3)=0
We open the parentheses according to the formula:
a(x+b)=ax+ab a(x+b)=ax+ab a(x+b)=ax+ab
5×x+5×3=0 5\times x+5\times3=0 5×x+5×3=0
5x+15=0 5x+15=0 5x+15=0
We will move the 15 to the right section and keep the corresponding sign:
5x=−15 5x=-15 5x=−15
Divide both sections by 5
5x5=−155 \frac{5x}{5}=\frac{-15}{5} 55x=5−15
x=−3 x=-3 x=−3
−3 -3 −3