(find the values of y)

ysquared =169

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

Guest Jan 1, 2020

edited by
Guest
Jan 1, 2020

#1**+1 **

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.

MathCuber Jan 1, 2020

#2**+1 **

Thanks MathCuber

**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.**

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

.Melody Jan 2, 2020