Example

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

Question

$${ y }^{ 2 } -100=0$$

Answer

y=10,-10

Solution


Add \(100\) to both sides.
\[{y}^{2}=100\]
Take the square root of both sides.
\[y=\pm \sqrt{100}\]
Since \(10\times 10=100\), the square root of \(100\) is \(10\).
\[y=\pm 10\]
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