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Mathematics 6 Online
OpenStudy (anonymous):

Check my answer please. (incoming)

OpenStudy (anonymous):

\[\frac{ 2x }{ x+5 }+\frac{ 7 }{ x }-4=\frac{ 50 }{ x^2+5x }\]

OpenStudy (anonymous):

I get x = -5/2 and -3

OpenStudy (mertsj):

Multiply each term by the common denominator which is x(x+5)

OpenStudy (anonymous):

I did and when I finish out the solution I get \[2x^2+7x+35-4x(x+5)=50\] Then working through that get \[-2x-13x-15=0\] using the big X I get \[(-2x-5)(x+3)\]

OpenStudy (mertsj):

\[2x^2+7(x+5)-4(x^2+5x)=50\]

OpenStudy (mertsj):

\[2x^2+7x+35-4x^2-20x=50\]

OpenStudy (mertsj):

\[-2x^2-13x-15=0\]

OpenStudy (anonymous):

Which is what I received above so am I getting something wrong with X

OpenStudy (mertsj):

\[2x^2+13x+15=0\] \[(2x+3)(x+5)=0\]

OpenStudy (mertsj):

\[x=- \frac{3}{2}, -5\]

OpenStudy (anonymous):

how did -2x^2-13x-15=0 become all positive?

OpenStudy (mertsj):

Multiply both sides by -1 and see what you get.

OpenStudy (anonymous):

mmm, ok I am still receiving the wrong answer for x though

OpenStudy (mertsj):

You have to discard the answer x = -5 because the denominator cannot be 0

OpenStudy (anonymous):

mmm ok so for restrictions there would be none then

OpenStudy (mertsj):

Any number that causes the denominator to be 0 is excluded. So x cannot be 0 and x cannot be -5. Those are the restrictions.

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