Question 4

The sum of -7pq and 2pq is
a) -9pq
b) 9pq
c) 5pq
d) -5pq

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Solution

d) -5pq
$\to$ Given, monomials are -7 pq and 2 pq.
$∴$ Their sum $= - 7 p q + 2 p q = (- 7 + 2) p q$
[both monomials consist of like terms, so adding their numerical coefficient]
$= - 5 p q$

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