Question

expand : ( p+q+r)^2
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Answer 1

Answer:

Step-by-step explanation:

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

= (p×p) + (p×q) + (p×r) + (q×p) + (q×q) + (q×r) + (r×p) + (r×q) + (r×r)

= p^2 + qp + rp + qp + q^2 + rq + rp + rq + r^2

Brring like terms together

= p^2 + 2qp + 2rp + 2rq + r^2