Expand (p-2q -3r}2 by using Identity.
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Answer:
(p-2p-3r)²=p²+4q²+9r²-4pq+12qr-6pr
Step-by-step explanation:
(a+b+c)²=a²+b²+c²+2(ab+bc+ca)
If,
a=p
b=-2q
c=-3r
Then,
(p-2p-3r)²=(p)²+(-2q)²+(-3r)²+2(p×-2q-2q×-3r+p×-3r)
(p-2p-3r)²=p²+4q²+9r²-4pq+12qr-6pr
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