If asked to multiply out a set of brackets, one must remember to multiply each term in a set of brackets by every term in the other set of brackets. For example, (x+2)(x-4) = x2+2x-4x-8 = x
in an inverse function, simply put the x and y are inversed: meaning x becomes y, and y becomes x
f(x): y=3x-5
f-1(x): x=3y-5 <=> x+5=3y <=> (x+5)/3 = y <=>