Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$${ x }^{ 2 } -4=0$$

Answer

x=2,-2

Solution


Add \(4\) to both sides.
\[{x}^{2}=4\]
Take the square root of both sides.
\[x=\pm \sqrt{4}\]
Since \(2\times 2=4\), the square root of \(4\) is \(2\).
\[x=\pm 2\]
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