Question

how to find the missing denominator/numerator in multiplying rational expressions

Answer 1

can u post an example?

Answer 2

cn u give an example of what you are asking?

Answer 3

_______/x+2 . x+2/x-3 = x+3

Answer 4

so how can i find the numerator??

Answer 5

Problems like this?\[(\frac{?}{x+2})(\frac{x+2}{x-3})=x+3\]

Answer 6

take the unknown as a variable, say suppose y. then simplify yourexpression and get the value of y by solving

Answer 7

@shane_b yes

Answer 8

The math behind these is essentially same as any other fractions. In your example, you can immediately cancel out the (x+2)'s on the left side to simplify it.

Answer 9

in your example, y= (x+3)(x-3)

Answer 10

so your numerator would be x^2-9

Answer 11

what does ^ mean?

Answer 12

exponent: \[x^2\]

Answer 13

Here's it done in pretty text:\[\frac{y}{x-3}=x+3\]\[y=(x+3)(x-3)\]\[y=x^2-9\]

Answer 14

Just remember, the normal fraction/equation rules apply...no matter how complicated the problem starts off looking.

Answer 15

thank you so much

Answer 16

you're welcome. Good luck :)