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I am confused 5/(3+4x) = 4/(4x+3).

 

If we cross multiply, we get

5(4x+3) = 4(3+4x)

20x+15=12+16x

4x +15 = 12

4x = -3

x = -3/4

but, if we multiply both sides by (4x+3), we get

5=4 no solution which one is right and why the the wrong one wrong?

 

 

why cant we distribute here? 5(4x+3) = 4(3+4x)

 Jan 11, 2021
edited by Guest  Jan 11, 2021
edited by Guest  Jan 11, 2021
 #1
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Note that we can  see that there is no solution to this....re-writing, we have

 

5/ (4x + 3)  = 4 / (4x + 3)

 

We can't divide 5  by someting and get the same result as dividing  4 by the same someting

 

So....no solution

 

 

cool cool cool

 Jan 11, 2021

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