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Mihaela9996
a fost răspuns

Cum se calculează ecuatia 7x - 3x pătrat =0 ?

Răspuns :

(7x-3x)^2=0
7x-3x=0
4x=0
x=0
Caz I:
                [tex]7x-(3x)^2=0\\ 7x-9x^2=0\\ x(7-9x)=0\\ 7-9x=0(0:x)\\ -9x=-7\\\\ x= \frac{7}{9} [/tex]
Caz II: [tex](7x-3x)^2=0=\ \textgreater \ x=0~pt~ca~(7*0-3*0)^2=0*0=0[/tex]

Caz III:  [tex]7x-3x^2=0\\ x(7-3x)=0\\ 7-3x=0\\ -3x=7\\ x= \frac{7}{-3} [/tex]


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