Question

If f(1) = 160 and f(n+1)=-2f(n), what is f(4)? someone please explain how to do this

Answer 1

f(1) = 160

f(2) is -2 times the previous value

f(2) = -2 *f(1) = -2 * 160 = -320

f(3) = -2 * f(2) = -2 *(-320) = 640

f(4) = -2 * f(3) = -2 * 640 = -1280

f(4) = -1280