Question

Add the following:
$2p^2{q}^2-3pq+4,5+7pq-3p^2{q}^2$

• A. $-p^2{q}^2-4pq+9$
• B. $-p^2{q}^2+4pq+9$
• C. $-p^2{q}^2+2pq-9$
• D. None of these

Answer 1

The correct option is B $-p^2{q}^2+4pq+9$

$2p^2{q}^2-3pq+4+5+7pq-3p^2{q}^2$

$=2p^2{q}^2-3p^2{q}^2-3pq+7pq+9$

$=-p^2{q}^2+4pq+9$