Let f(x) = x2 − 81. Find f−1(x)
This equation states that x equals -1. So you plug in -1 to all the x's and solve. So, your equation would be f(-1) = (-1)(2) - 81So, f(-1) = -2 - 81Then, this means that f(-1) = -83So........f(-1) is equal to -83