F(X) means plug in te number within the parenthesis for the given function. It's simply an equation expressed through different notation. In this case it asks you to plug in two, so you do: -3(2)+4 = f(2) That means that f(2)=-2.
Answer: (b+4) and (b-1) Explanation: do a generic rectangle b times b is b^2 b times 4 = 4b -1 times b = -1b -1 times 4 = -4 b^2+4b-1b-4 simplify b^2+3b-4
