Question

Provide a counter example:
If x^2=36 then x equals 18 or -18

Answer 1

that first one is wrong... x would equal + or - six

Answer 2

To provide a counter example, replace x with 18 in the original equation as follows:

If x^2 = 36 and x = 18, then:

(18)^2 = 36
324 = 36
False