sloving for x

**jsu03** · March 2nd 2010, 09:56 AM

can someone help me solve for x, thanks!

4.8 = (1.2 + 2x/2)^2/(.30 - x/2)

i have tried to mult. 4.8 with (.30 - x/2) but doesnt get the correct numbers.

**masters** · March 2nd 2010, 10:57 AM

Originally Posted by jsu03

can someone help me solve for x, thanks!

4.8 = (1.2 + 2x/2)^2/(.30 - x/2)

i have tried to mult. 4.8 with (.30 - x/2) but doesnt get the correct numbers.

Hi jsu03,

Is this your equation?

$4.8=\dfrac{\left(1.2+\dfrac{2x}{2}\right)^2}{\left (.30-\dfrac{x}{2}\right)}$

That piece where $\frac{2x}{2}$ bothers me. If this is, in fact, your equation, it all boils down to

$x = 0$ .

**jsu03** · March 2nd 2010, 05:35 PM

Oh no, the 1.2 + 2x is all over 2 : ((1.2 + 2x )/ 2)^2 and so is the
((.30 - x)/2)

**HallsofIvy** · March 3rd 2010, 04:46 AM

Originally Posted by jsu03

Oh no, the 1.2 + 2x is all over 2 : ((1.2 + 2x )/ 2)^2 and so is the
((.30 - x)/2)

Parentheses are good!

Okay, your equation is $4.8= \frac{((1.2+ 2x)/2)^2}{.3- x/2}$ . If you go ahead and multiply boht sides by .3- x/2 as you say, you get $1.44- 2.4x= \left(\fra{1.2+ 2x}{2}\right)^2= \frac{(1.2+ 2x)^2}{4}$ .

You might as well go ahead and multiply both sides by 4 as well:
[tex]5.76- 9.6x= (1.2+ 2x)^2]/math]

Now multiply out that right side:

5.76- 9.6x= 1.44+ 4.8x+ 4x^2

.

Solve that quadratic equation for x. Don't forget to put the answers back into the origin

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