Question

What are the square roots of 256?
a 13 and –13
b 15 and –15
c 16 and –16
d 128 and –128

Answer 1

use calculator

Answer 2

i did i only get 1 answer!

Answer 3

C

Answer 4

calculator wont give the answer holding negative sign

Answer 5

@pigrenex how do you get that?

Answer 6

a negative squared will always be positive

Answer 7

But in real maths there are 2 answers +16 & -16 since when both squared , we get 256

Answer 8

Notice how 16*16 = 256 and (-16)*(-16) = 256

So this points us to the answer of C

Answer 9

hence , C

Answer 10

but whenever you will try to find out the squareroots of a number you will get two..

Answer 11

-16 x -16 = 256
every time you multiply equal signs, you get a positive answer

Answer 12

(+)*(+)=(+) & (-)*(-)=(+)

Answer 13

ok i got it thanks every one :)

Answer 14

a fun way to solve

\(x^2 = 256\)
\(x^2 - 256 = 0\)
\((x+16)(x-16) = 0\)

\(x = 16; x = -16\)

Answer 15

wc:)