(6p-5q+5r)(-2p-7q+8r)
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Solution:-
(6p-5q+5r)(-2p-7q+8r)
=> 6p(-2p-7q+8r) -5q(-2p-7q+8r)+5r(-2p-7q+8r)
=> -12p²-42pq+48pr+10pq+35q²-40qr-10pr-35qr+40r²
=> -12p²-32pq+38pr+35q²-75qr+40r²
=> -12p²+35q²+40r²-32pq+38pr-75qr
Hope it helps you
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