I am doing this problem a+3 / a - 5 x 2a - 10 / 3a + 9 the answer given is 2/3 but as there are 3 a's in the numerator line and 4 a's in the denominator line how do these cancell out?
ok, you need to be more clear as to what you mean. if you can't use latex, type fractions like this:
(numerator)/(denominator)
example, type (2x + 5)/(x + 9) to mean
i think you mean but i am not sure. that is certainly not what you typed, but it is probably what you meant
"Cancel"? What is that? Never do that.
-- That's right, the Distributive Property of Multiplication over Addition
-- What's that? Multiplication?
-- Now we see the Commutative Property of Multiplication.
-- Same thing, but only in the denominators.
-- At last, an Identity Definition and Identity Property
There is no "cancelling" going on in there. "Cancelling" is bad. Properties of mathematics will solve math problems. There is a reason why you studied those properties. I dare you to show me a text book that describes the "Property of Cancelling".
Special Note: This is good only for and . You tell me why.