Answer :

konrad509
[tex]x^2-4x=0\\ x(x-4)=0\\ x=0 \vee x=4[/tex]

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[tex]3x^2=48\\ x^2=16\\ x=-4 \vee x=4\\\\ \hbox{or}\\\\ 3x^2-48=0\\ 3(x^2-16)=0\\ 3(x-4)(x+4)=0\\ x=4 \vee x=-4[/tex]

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