Question

Find a counterexample that disproves the conjecture.

If x^2 - 16 = 0, then x = 4.

Answer 1

Any help would be greatly appreciated and best answer chosen quickly.

Answer 2

x=-4

Answer 3

Thanks, can you explain a little bit more?

Answer 4

a counter example is a statement that makes the conjector false
plugging in x=-4
\[(-4)^{2}-16\]
gives zero
the 1st statement says only x=4 is the definite solution
x=-4disproves that