Question
Subtract: $ab - bc - ca$ from $- ab + bc + ca.$
✓
Answer
We have, $-ab + bc + ca - (ab - bc - ca)$
$= -ab + bc + ca - ab + ba + ca$
On combining the like terms.
$= -ab - ab - bc + bc + ca + ca$
$= -2ab + 2bc + 2ca$
$= -ab + bc + ca - ab + ba + ca$
On combining the like terms.
$= -ab - ab - bc + bc + ca + ca$
$= -2ab + 2bc + 2ca$
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