Why? Well, let's first simplify x^2 - 3x - 10 and x^2 + x - 12; the two denominators. Each of these should become an (x +/- number), and to figure out the number, as well as whether it is positive or negative, we can do a simple trick

Look at the factors of the right number (In this case, -10 and -12)

-10 -12

1 * -10 1 * -12

-1 * 10 -1 * 12

-2 * 5 -2 * 6

2 * -5 2 * -6

-3 * 4

4 * -3

Now for part 2

Which of these pairs add up to the middle number? One of the pairs of -10 should make -3, and likewise, one of the pairs of -12 should make 1 (when x has no number in front of it you may safely assume it is 1).

2 - 5 = -3 and 4 - 3 = 1, so we now know that the 2 fraction equations simplified is

x + 2 / (x + 2)(x - 5) * x - 3/(x -3)(x + 4)

Notice anything repeating? As long as they are apart of the same fraction, we can cross out anything that has the same x - number. Crossing out both x + 2 and x - 3, we now simply have x - 5 * x + 4. Because we crossed out both numerators, the top numbers both become 1, thus giving our answer, C.

8 0

3 years ago

I need help on iready

kicyunya [14]

Answer:

the answer is 3

Step-by-step explanation:

because if you do the methoes method you know that it rules out 1 and 2 after you do that its just between 3 and 4, for the caunususicon there has to be one, that is why i think its 3. hope this helps!

7 0

3 years ago

Yesterday Bethany sent 60 text messages she said that 15% of those messages were to her best friend how many text messages didn'

V125BC [204]

Answer:

51 messages

Step-by-step explanation:

15% of 60

15*60 = 900

900/100 = 9

and now 60-9 = 51

Final answer: She didnt sent 51 messages to her friend