+0

# Test: Square root of 16?

0
124
4

What is the square root of 16?

Oct 20, 2020

#1
0

What is the square root of 16?

It's +4.  Don't forget there are two roots, one positive and one negative.

.

Oct 20, 2020
#2
+2216
+1

The square root of 16, as Guest said, would be 4 and -4.

Note that (-4)^2 and 4^2 both equal 16 :)

Oct 20, 2020
#3
+1457
+1

Question:  What is the square root of 16?

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~                                                                                                                        The fact is that  -42 = 42 = 16   but   sqrt(16) = 4

5 + sqrt(16) = 5 + 4 = 9

5 - sqrt(16) = 5 - 4 = 1

Oct 20, 2020
edited by Dragan  Oct 20, 2020
#4
+112502
+1

Dragan is correct

$$\sqrt{16}=+4\qquad \text{By convention}\\~\\ \\But\\ if\;\;y^2=16\\then\\ y=\pm\sqrt{16}=\pm4$$

So if the sqrt root sign or the power of 1/2 is already in the question then the answer is positive (by convention).

But

If you add the square root in, as a part of the solution THEN the answer is positive OR negative.

Melody  Oct 21, 2020