Question

1. Can cross multiplication be used to solve this problem? Why or why not?


HELP

Answer 1

x =0 and x =2/3

Explanation:

as is no

but if you put an x under the 3 to make 3x/x

then you'd have 3x+5/x = 7/x

to make

3x^2 + 5x = 7x

this makes

3x^2 -2x =0

using the quadratic formula

answers

x =0 and x =2/3

Answer 2

Explanation:

Cross multiplication can be used but not in the beginning. First x should be isolated.

`3 +(5)/(x)=(7)/(x)\\\\`

Now subtract
`(5)/(x)` from both sides

`3 = (7)/(x)-(5)/(x)\\\\3=(7-5)/(x)\\\\3=(2)/(x)`

In this stage, cross multiplication can be used.

`(3)/(1)=(2)/(x)\\\\3*x=2*1\\\\x = (2)/(3)`