Changing the subject when it appears twice.
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Transcript Changing the subject when it appears twice.
Changing the subject of a
formula 3 new subject appears twice
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Copyright © R F Barrow 2010, all rights reserved
Make x the subject of this formula
ax 7 3 x d
a x 7 3x d
3x
a x 3x 7 d
7
a x 3x d 7
factorise
x a 3 d 7
a 3
x
d 7
a3
Make x the subject of this formula
c 2a x b d 5x
c 2 ax bd 5 bx
5 bx 2 ax bd c
x 5 b 2 a bd c
x
bd c
5b 2 a
Make x the subject of this formula
y
2x 3
x4
y x 4 2x 3
xy 4 y 2 x 3
xy 2 x 3 4 y
x y 2 3 4 y
x
3 4y
y2
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