- #1

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multiplying both sides by x, subtracting both sides by 9 etc. . doesnt give me the quadratic.

- Thread starter alpha01
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- #1

- 77

- 0

multiplying both sides by x, subtracting both sides by 9 etc. . doesnt give me the quadratic.

- #2

tiny-tim

Science Advisor

Homework Helper

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Hi alpha01!

erm … I think you put 9 on the right-hand side instead of 9x.

erm … I think you put 9 on the right-hand side instead of 9x.

- #3

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( x (12x + 9 ) ) / x = x ( x + 9 )

multiplied x on the left hand side cancels out with its denominator & by expanding the right hand side you will get;

12x + 9 = x^2 + 9x

Subtracting both sides by (12x + 9);

0 = x^2 +9x - 12x - 9

which means;

x^2 - 3x - 9 = 0

& thats what you are looking for...

- #4

- 77

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Subtracting both sides by (12x + 9);

thanks

- #5

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Your welcome !!! :)

- #6

- 1,707

- 5

how would he get a quadratic thenHi alpha01!

erm … I think you put 9 on the right-hand side instead of 9x.

- #7

- 1,707

- 5

sorry misread and now i can't delete

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