Question

solve the equation:
3/(x+1) = 1/(x^2-1)

Answer 1

\[\frac{3}{x+1}=\frac{1}{x^2-1}\]
Cross multiply

Answer 2

Notice x^2 - 1

Answer 3

\[3x^2-3=x+1\]

Answer 4

\[3x^2-x-4=0\]

Answer 5

\[(3x-4)(x+1)=0\]

Answer 6

\[3x-4=0\]

Answer 7

\[x=\frac{4}{3}\]

Answer 8

\[x+1=0\]
\[x=-1\]

Answer 9

But of course x cannot be -1 because then x^2-1 (the denominator) would be 0 so discard that and x = 4/3

Answer 10

Thank you. Can you help me with this one?
3/(x) = 12/x+7

Answer 11

Same thing. Cross multiply. What do you get?

Answer 12

3x+21=12x

Answer 13

\[12x=3x+21\]

Answer 14

Yes. Not finish it up.

Answer 15

3x-12x+21
-9x=21

Answer 16

That would be positive 9x

Answer 17

oh