2. It is given that 1/a-2b+1/c=c .
a) Change the subject of the formula to a.
Simplify the following.
1 /x-4 - x/ (4-x)(4-x)
Thank you so much!!
Maths
2007-11-03 10:25 am
回答 (1)
2007-11-03 10:31 am
✔ 最佳答案
1/a - 2/b + 1/c = c1/a = 2/b + c - 1/c
1/a = (2c + bc^2 - b)/bc
a = bc / (2c + bc^2 - b)
1/(x-4) - x / (4-x)(4-x)
= [ (x-4) - x ] / (x-4)(x-4)
= -4 / (x-4)^2
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