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cookster · Sep 16, 2009, 10:24 AM

ab+c=bc-a

make a the subject form

can anyone help with this.

Unknown008 · Sep 17, 2009, 07:36 AM

$ab+c=bc-a$

Firstly, get all the 'a's on one side. To do this, add 'a' to both sides

$ab+c+a=bc\cancel{-a+a}$

Now, remove the 'c' from the left side. To do this, subtract c on both sides.

$ab\cancel{+c-c}+a=bc-c$

$ab+a=bc-c$

Factorise a on the left.

$a(b+1)=bc-c$

Divide both sides by (b+1);

$\frac{a\cancel{(b+1)}}{\cancel{(b+1)}}=\frac{bc-c}{b+1}$

$a=\frac{bc-c}{b+1}$

I hope it helped! :)