Question

Simplify
(a) (2p + 3q + 4r)(9p - r) + (p + q + r)(p-q)

please solve step by step
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Answer 1

Answer:

19p^2-q^2-4r^2+28pq+35pr-4qr

Step-by-step explanation:

=9p(2p+3q+4r)-r(2p+3q+4r)+p(p+q+r) -q(p+q+r)

=18p^2+27pq+36pr-2pr-3qr-4r^2+p^2+pq+pq+pr-pq-

q^2-qr

=19p^2-q^2-4r^2+28pq+35pr-4qr