Question

Solve x2 = 144.

72
12
±12
−12

Answer 1

well
what numbers squared give you 144?

Answer 2

here is example:
solve x^2=9
well 3^2 and (-3)^2 both give by 9
so x=3 or x=-3 are both solutions to x^2=9

Answer 3

there are two solutions
if you take the square of both sides
you need to be careful of how you interpret sqrt(x^2)
this actually is the same thing as |x|
so
\[x^2=144 \\ \sqrt{x^2}=\sqrt{144} \\ |x|=12 \\ \]
this will give two solutions (not just one)

Answer 4

Thanks

Answer 5

x= positive or negative 12