Question

Expand the following (p+2q+3r)²

Answer 1

Answer:

p²+q²+q²+r²+r²+r²

Step-by-step explanation:

Answer 2

Answer:

Step-by-step explanation:

Let a = p b= 2q c= 3r

(a+b+c)^2 = a^2 + b^2 + c^2 +2ab + 2bc + 2ac

=p^2 + (2q)^2 + (3r)^2 + 2(p)(2q) + 2 (2q)(3r) + 2 (p)(3r)

= p^2 +4q^2 + 9r^2 +4pq + 12qr + 6pr

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