Determine whether the statement is true or false. If f(1) > 0 and f(7) < 0, then there exists a number c between 1 and 7 such that f(c) = 0

Look, when you want to do something like put it like x^2. x2 could mean x² or x₂. so to clear confusion, know the notation. to find the product multiply the x's and you get -8x and the y's and you get 6y. since it's all being multiplied it is just -8x6y, or answer a. although the better answer is -48xy(combining -8 and 6) because you should multiply constants whenever you can.