Answer :

konrad509
[tex]7x^2=28\\ x^2=4\\ x=-2 \vee x=2[/tex]
[tex] 7x^{2} = 28[/tex]

[tex] x^{2} = \frac{28}{7} [/tex]

[tex] \frac{28}{7} = 4 [/tex]

[tex] x^{2} = 4 [/tex]

[tex]x = 2[/tex] or  [tex]x = -2[/tex]

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