Hi. I'm unsure if this is the right place to post, but i'm after some help. I have been out of school for a long time and I haven't done any math like this in about 15 years, so i'm very much behind the ball.
The equation I have been given is (listed in steps of rearranging)
1) 4.68 x10-5 = ((2.5 - x)(5 - 2x)2) / (1 - y)
2) 4.68 x10-5 = ((2.5 - x)(5 - 2x)2) / (1 - y) x10-6
3) 46.8 (1 - y) = (2.5 - x) (4x2 - 20x + 25)
4) 46.8 (x - 1) = -4x3 + 30x2 - 75x + 62.5
5) 0 = -4x3 + 30x2 – 121.8x + 109.3
So, I understand all of whats happening in the brackets. That's algebra I can remember. But I'm stumped at where the number x10-6 is coming from at the end of (1-y) in step 2 and how they are changing 4.68 x10-5 into 46.8 in step 3. Perhaps i've bitten off more than I can chew.
Any explanation would be appreciated. Thanks.
The equation I have been given is (listed in steps of rearranging)
1) 4.68 x10-5 = ((2.5 - x)(5 - 2x)2) / (1 - y)
2) 4.68 x10-5 = ((2.5 - x)(5 - 2x)2) / (1 - y) x10-6
3) 46.8 (1 - y) = (2.5 - x) (4x2 - 20x + 25)
4) 46.8 (x - 1) = -4x3 + 30x2 - 75x + 62.5
5) 0 = -4x3 + 30x2 – 121.8x + 109.3
So, I understand all of whats happening in the brackets. That's algebra I can remember. But I'm stumped at where the number x10-6 is coming from at the end of (1-y) in step 2 and how they are changing 4.68 x10-5 into 46.8 in step 3. Perhaps i've bitten off more than I can chew.
Any explanation would be appreciated. Thanks.