Question

x^2=16 answer is +-4? how?

Answer 1

Hold on let me draw this,

Answer 2

4*4=16

(-4)(-4)=16, because two negatives multiplied together is a positive.

Answer 3

Just like (-1)(-1) = 1

Answer 4

4^2 = 16

16 = 16 it is right,


Now as to why it says +-4 is because if its negative, -4^2 = -4 * -4 so two negatives = a positive which is 16

4 * 4 = 16

So regardless if its negative, when you square it it'll be positive :D

Answer 5

where did the 4 * 4 come from? or the negatives, or anything im so confused

Answer 6

4^2 is the same as 4 * 4

It's a copy it self multiplied by it self,

Same thing like 7^2

7^2 = 7 * 7

or even 5^9

5 ^ 9 = 5*5*5*5*5*5*5*5*5

Answer 7

WAIT i think i got it

Answer 8

:P

Answer 9

4 times 4 = 4^2. You multiply the base number (4 in this case) by itself the number of times in the exponent Also, if you graph x^2=16, you will get a parabola. In the graph, where y=0, x=-4 and 4

Answer 10

so its just like a quess? like you're like "oooh well 4^2 is 4*4 so that is equal to 16" So like that? hahaha

Answer 11

Not a guess,

4^2 is 16


4 * 4 = 16

Answer 12

well yeah but it starts out as x so you guess 4 because 4 times 4 is 16

Answer 13

4*4 is the same thing as 4+4+4+4

Answer 14

No you do the inverse,

The inverse of a square, is a square root,

So, suppose you wanted to find: x^2 = 81

Square rooting both sides gives me x = 9

9^2 = 81

Answer 15

A square root is ^ 1/2
A square is ^2

A square root is a number that produces a specified quantity when multiplied by itself.

Answer 16

Do you understand @AmberLynn127