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Add: $20 x^{2} y^{2} z and -10 x^{2} y^{2} z$
Solution:
Add 20 x^2 y^2 z and − 10 x^2 y^2 z means
$20 x^{2} y^{2} z + (− 10 x^{2} y^{2} z)$
= $20 x^{2} y^{2 }z − 10 x^{2} y^{2} z$
= $10 x^{2} y^{2} z$ as they are like terms
So $20 x^{2} y^{2} z + (− 10 x^{2} y^{2} z) = 10 x^{2} y^{2} $z
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