Question

Letrx)= x?. If r(x) = 4, find x2-24Both 2 and -2 are correctNone of the choices are correct.

Answer 1

r(x) = x^2

If r(x) = 4

4 = x^2

Solve for x:

√4 = x

x = 2 and x= -2

Both 2 and -2 are correct