Question

Solve for x: log3^x+log3(x+2)=log3^9

Answer 1

x(x+2) =9

Answer 2

x^2+2x-9 =0

Answer 3

Solve using quadratic formula. Ignore the negative solution.

Answer 4

\[x= \frac{ -2 +\sqrt{40} }{2}\]

Answer 5

They mean the bases are 3

Answer 6

\[x= \frac{-2 +2\sqrt{10} }{2} = -1+\sqrt{10}\]

Answer 7

hey elecenineer check my question
do you know directional direvatives

Answer 8

The reason why you ignore the negative soln is because log(x) occurs in the original question. You cannot take log of a negative.

Thus why I did x= (-b + sqrt{b^2-4ac} ) / 2a

I didn't do +- because the - case results in a negative solution

Answer 9

elecengineer you are right
your ans work but thanks to both of your