Melanie953

05-26-2009, 04:17 PM

The Question I have is xSqared - 3x - 10 = 0

Please Please Please help me i have no clue how to do it!

Thank you :D

Please Please Please help me i have no clue how to do it!

Thank you :D

View Full Version : Quadratic Function: xSqared - 3x - 10 = 0

Melanie953

05-26-2009, 04:17 PM

The Question I have is xSqared - 3x - 10 = 0

Please Please Please help me i have no clue how to do it!

Thank you :D

Please Please Please help me i have no clue how to do it!

Thank you :D

Subhotosh Khan

05-26-2009, 04:23 PM

The Question I have is xSqared - 3x - 10 = 0

Please Please Please help me i have no clue how to do it!

Thank you :D

Then why are you even trying to do this problem?

For a refresher to:

http://www.purplemath.com/modules/solvquad.htm

Please Please Please help me i have no clue how to do it!

Thank you :D

Then why are you even trying to do this problem?

For a refresher to:

http://www.purplemath.com/modules/solvquad.htm

mathpedia

05-27-2009, 02:28 AM

The Question I have is xSqared - 3x - 10 = 0

Please Please Please help me i have no clue how to do it!

Thank you :D

When you have an expression that contains a square root, the best way to solve it, is to separate the square root from the other terms, and then raise the expression to the 2nd power. Of course, first you the condition the term under the square root, to be greater or equal to 0:

x \geq 0

\sqrt{x} - 3*x - 10 = 0 <=> \sqrt{x} = 3*x + 10 <=> x = (3*x + 10)^2 <=> x = (9*x)^2 + 60*x + 100 <=>

( 81*x^2 + 59*x + 100 = 0. From the formula of quadratic equation, we get:x1,2 = \frac{(-59 \pm \sqrt{59*59 - 4*81*100})}{2*81}. Because \sqrt{59*59 - 4*81*100})} < 0 => We have no real solution for your equation.

Please Please Please help me i have no clue how to do it!

Thank you :D

When you have an expression that contains a square root, the best way to solve it, is to separate the square root from the other terms, and then raise the expression to the 2nd power. Of course, first you the condition the term under the square root, to be greater or equal to 0:

x \geq 0

\sqrt{x} - 3*x - 10 = 0 <=> \sqrt{x} = 3*x + 10 <=> x = (3*x + 10)^2 <=> x = (9*x)^2 + 60*x + 100 <=>

( 81*x^2 + 59*x + 100 = 0. From the formula of quadratic equation, we get:x1,2 = \frac{(-59 \pm \sqrt{59*59 - 4*81*100})}{2*81}. Because \sqrt{59*59 - 4*81*100})} < 0 => We have no real solution for your equation.

Denis

05-27-2009, 06:22 AM

The equation is x^2 - 3x - 10 = 0 : NO square root.

(x - 5)(x + 2) = 0

I see from your link that you charge $30 an hour.

(x - 5)(x + 2) = 0

I see from your link that you charge $30 an hour.

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