Question

Expand (p-2q -3r}2 by using Identity.

Answer 1

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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