Question

x+7=0 x-4=0 (x+7)(x-4)=0 how would you compare the three questions? what value(s) of x would make each equation true?

Answer 1

$x+7=0 \\ \boxed{x=-7} \\ \\ x-4=0 \\ \boxed{x=4} \\ \\ (x+7)(x-4)=0$
$x+7=0$ or $x-4=0$
$x=-7$ or $x=4$

S= {-7 ; 4}

Answer 2

$(x+7)(x-4)=0 \Leftrightarrow x+7=0 \vee x-4=0\\ x=-7 \vee x=4$