Question

logx+log(3x-13)=1
I got the answer of 10/3 can someone see if that is right??

Answer 1

no it is wrong.

Answer 2

Ok, thank you.

Answer 3

log(3x2-13x) = 1
3x2-13x = 10

Answer 4

I see what I did wrong. I put 26 instead of 13..

Answer 5

Wait.. no I didnt. Then I move the 10 over right?

Answer 6

giving me: 3x2-13-10=0 right?

Answer 7

right

Answer 8

Then I did the quadratic... maybe I did that wrong

Answer 9

3x2-15x+2x-10

Answer 10

where did you get the middle? -15x+2x?

Answer 11

-13x can be represented as -15x +2x.

Answer 12

why would I want to put that into my equation?

Answer 13

when I have 3x2-13x-10. Would you do the quadratic then?

Answer 14

is the answer 5

Answer 15

it is a method to factor the quadratic equation.
3x2-13x-10 = 0
3x2-15x+2x-10 = 0
3x(x-5)+2(x-5)= 0 ,factor out x-5,
(x-5)(3x+2)=0.
so, x= 5 and x = -3/2

Answer 16

got it!!! Thank you. I didnt notice it factored.

Answer 17

you should always see if a quadratic equation can be factored, it is much easier. If that fails, do the formula to solve

Answer 18

I usually do, my teacher just never gives us the ones that factor...lol.Thanks

Answer 19

you are welcome