Question
Add the following expression: $ab + bc + ca$ and $- bc - ca - ab$
✓
Answer
We have, $ab + bc + ca + (-bc - ca - ab)$
$= ab + bc + ca - bc - ca - ab$
On combining the like terms.
$= ab - ab + bc - cb + ca -ca$
$= 0 + 0 + 0 = 0$
$= ab + bc + ca - bc - ca - ab$
On combining the like terms.
$= ab - ab + bc - cb + ca -ca$
$= 0 + 0 + 0 = 0$
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