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p4-(q+r)4
= (p2)2-{(q+r)2}
=(p2)2 -(q2+r2+2qr)2
= (p2 + q2+ r2+ 2qr)(p2-q​2-r2-2qr)
IS THIS ANSWER CORRECT

p4 - (q + r)4 
= (p2)2 - {(q + r)2}2
= {(p2) - (q2 + r2 + 2qr)} {(p2)  + (q2 + r2 + 2qr)}
= (p2 - q​2 - r2 - 2qr) (p2 + q2+ r2  + 2qr) 

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THE SECOND PART HAS  2 SIGN AT THE END.
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