Question

Which of the following are solutions to the equation below?

Check all that apply.

x2 - 64 = 0

A. -8
B. 16
C. -16
D. 2
E. 64
F. 8

Answer 1

x^2 - 64 = 0
add 64 to both sides
what do you get?

Answer 2

-64 + 64 = ?
0 + 64 = ?

Answer 3

64+64= 128
0+64= 64

Answer 4

no -64 + 64 = 0

0 + 64 = 64 - thats correct

Answer 5

so we have

x^2 = 64

to find x we need to find the square roost of 64

Answer 6

what number multiplied by itself gives 64?

Answer 7

like 3 * 3 = 9
so 3 is the square root of 9

similarly 4 is the square root 16, as 4^2 = 16

Answer 8

in fact there are 2 square roots
because -3*-3 = 9


so the 2 square roots of 9 are 3 and -3

anf for 16 we have 4 and -4

Answer 9

try multiplying some of the options by themselves and see if you can get 64
- if you do thats the answer