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Subject Of The Formula Have I done it right?

http://prntscr.com/aygjzz

The question said to rearrange this formula to make x the subject.

The formula being on top of that sheet.

Have I answered it correctly?
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Notnek
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Original post by junayd1998
http://prntscr.com/aygjzz

The question said to rearrange this formula to make x the subject.

The formula being on top of that sheet.

Have I answered it correctly?

Your second line is wrong - you've made a common error.

Remember the algebra rule : do the same to the whole of the left-hand-side as you do to the whole of the right-hand-side.

So if you want to multiply both sides by 2 you have:

2p=2(3x+πx2)\displaystyle 2p = 2\left(3x+\frac{\pi x}{2}\right)

2p=6x+πx\displaystyle 2p = 6x + \pi x
Original post by junayd1998
http://prntscr.com/aygjzz

The question said to rearrange this formula to make x the subject.

The formula being on top of that sheet.

Have I answered it correctly?


There's an error on your second line, where you multiply both sides by 2. (You didn't mutliply the 3x term correctly). Otherwise, it's fine.

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