Question 1203435
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Solve the equation y^2=81
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             <U>Solution 1</U>



y^2 = 81  implies  y = +/- {{{sqrt(81)}}} = +/- 9  (taking square roots from both sides).


<U>ANSWER</U>.  There are two solutions:  y= 9  and  y= -9.



             <U>Solution 2</U>



y^2 = 81 

y^2 - 81 = 0


Factor left side

(y-9)*(y+9) = 0.


There are two solutions  y= 9  and  y= -9.    <U>ANSWER</U>
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Solved in two ways, for your better understanding.