Question

Error Analysis Describe and correct the error

student made when solving. kx + 3x = 4 for x.

kx + 3x = 4
kx + 3x - 3x = 4 - 3x
kx=4 - 3x
- 3x
x = 4*3* X​

Answer 1

Solving
`kx+3x=4`

for x

`x=(4)/(k+3)`

Explanation:

`kx+3x=4`

`kx+3x-3x=4-3x` here the student leave 'x' in both sides

The error is not notice the factor is the 'x'

So:

`kx+3x=4`

`x(k+3)=4\\x=(4)/(k+3)`

Is the best way to solving to 'x' 'k' maybe is knowing o is a constant