4/x +3/2x=11/4?

2008-07-05 7:28 am
solve the rational equation and state any restrictions on the variable?

回答 (6)

2008-07-05 7:39 am
✔ 最佳答案
Multiply by 4x, the lcd
4x(4/x+3/2x=11/4)
16+6=11x
22=11x
/11 /11
2=x
Check answer:
4/2+3/2*2=11/4
2.75=2.75
2008-07-05 2:50 pm
What is the REAL question?

Is it 4/x + 1.5x = 11/4

or

4/x + 3/(2x) = 11/4


??????????


Remember the Order of Operations and once you determine those you work left to right given the same order.

Therefore, your question is REALLY

4/x + 1.5x = 11/4

Is that what you meant??????

Please clarify and resubmit
2008-07-05 2:38 pm
4/x +3/2x=11/4

Step1) Multiply each sides by four. X+3/2X=11
Step2) Divide each sides with 1.5. X^2=7.333.....
Step3) Square root both sides. X= 2.7
2008-07-05 2:38 pm
Problem arises due to presentation of question.
Is it 3 / (2x) or (3/2) x ?

Try
4/x + (3/2) x = 11/4
16 + 6 x² = 11
6x² = - 5
x² = - 5/6 which now looks "suspicious" due to - ve sign !

So now try:-
4/x + 3 / (2x) = 11/4
16 + 6 = 11x
22 = 11 x
x = 2
Will settle for 2nd answer BUT SHOULD NOT HAVE TO GUESS WHAT QUESTION IS MEANT TO BE !
2008-07-05 2:35 pm
4/x + 3/2x = 11/4
4x(4/x + 3/2x) = 4x(11/4)
16 + 6 = 11x
22 = 11x
x = 22/11
x = 2
2008-07-05 2:34 pm
4/x + 3/2x = 11/4
On multiplying this equation by 4x,
16 + 6 = 11x
22 = 11x
x = 2


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