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(find the values of y)

ysquared =169

 

link : https://vle.mathswatch.co.uk/images/questions/question17107.png

 Jan 1, 2020
edited by Guest  Jan 1, 2020
 #1
avatar+435 
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Taking the square root of 169, you get y = 13.

But we also have to remember that y can be negative, giving us that y = -13. 

 

So our answers are y = 13, and y = -13.

 Jan 1, 2020
 #2
avatar+107551 
+1

Thanks MathCuber  laugh

 

Attn: asker

 

this is a good concept for you to work out quickly.

 

\(\sqrt{169}=+13\qquad \text{(never -13, this is by convention)}\\ \)

 

However if 

\(y^2=169\)

 

then it is you that must introduce the square root sign,

     which means that both the negative and the positive are answer.

 

\(y^2=169\\ y=\pm\sqrt169\\ y=+13\;\;\;\;or\;\;\;\;y=-13\)

.
 Jan 2, 2020

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