Question

Help me with this please?

Answer 1

what did you get as an answer? when you tried to work it out

Answer 2

Thats the problem, I'm not sure how to work it out.

Answer 3

Oh wait... never mind. This sin't the problem. I understand this one :)

Answer 4

isn't*

Answer 5

haha ok(:

Answer 6

This one sort of confuses me :\

Answer 7

\[3+5\sqrt{49}\]

Answer 8

@ceejays Thank you for answering but thats not the problem I need help with. Sorry, it was a mistake posting it and besides, the answer you gave isn't one of the selection.

Answer 9

give me a second @HaperFink22 and i will solve that problem

Answer 10

what are the answers

Answer 11

+1.6

Answer 12

@ceejays

Answer 13

@papsmurf +1.6? Thats the answer you got? How?

Answer 14

hang on i see where i messed up at

Answer 15

what are the answers?

Answer 16

@HaperFink22 do you know how to cross multiply over the equals sign?

Also, since the denominator (x -4) is the same on both sides, you can actually just drop both denominators... leaving you with... x = 4

Answer 17

the last one is what i got as well

Answer 18

But note you can only drop both denominators because they're exactly equal (x-4 on both). If they're different, you have to cross multiply.

Answer 19

So the subtraction sign doesn't make the number a negative?

Answer 20

When you cross multiply?

Answer 21

If you were to cross multiply, which makes this question a lot more work than is needed by dropping both denominators, you'd get:
\[\Large x(x-4) = 4(x-4)\]

Answer 22

I believe this question has no solutions.

Answer 23

@vinnv226 if you read other responses you'd know that's obviously not the case.

Which you then have to expand \[\Large x^2 - 4x = 4x- 16\]And get it all equal to zero, but subtracting 4x from both sides, and subtracting 16 from both sides:\[\Large x^2 - 8x +16 =0\]then factor it.

Answer 24

@agent0smith Solve that, then plug your solution into the original problem, and you'll see why there are no solutions.

Answer 25

Hmm, good point... odd that the answer key only offers real number solutions.

Answer 26

Nonetheless, you could've easily pointed that out in your first post... "If you plug in x=4, you get a zero denominator."

Answer 27

As it was mentioned earlier, the denominators are the same, so you don't even have to cross multiply. You can just set the numerators equal, so x=4. But you need to check your solutions in the original

Answer 28

Okay, thank you guys! :)

Answer 29

No prob. I think the answer key was somewhat flawed, it should have a "no solution" option.

Answer 30

Hi, there is no solution in the real number set for x, since x cannot be 4, which makes the denominator zero

Answer 31

oh sorry, just read the above comments, I've stated the obvious :D