Solve each equation by taking square roots. `k^2=76` ` x^2=21`

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hala718 eNotes educator| Certified Educator

`k^2 = 76`

`==gt k= +-sqrt76 `

Now we will factor 76.

==> 76 = 2*2*19

`==gt k= +-sqrt(76)= +-sqrt(2*2*19)= +-2sqrt19 `

`==gt k= +-2sqrt19.`

`x^2 = 21`

`==> x= +-sqrt21 ~~ +-4.58`

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