Question

7x²=28 I'm not sure about how to do thus problem

Answer 1

$7x^{2} = 28$

$x^{2} = \frac{28}{7}$

$\frac{28}{7} = 4$

$x^{2} = 4$

$x = 2$ or  $x = -2$

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Answer 2

$7x^2=28\\ x^2=4\\ x=-2 \vee x=2$