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A2+B*C= (4p+k)2+(p-5k)(-21p)= 16p2+8pk+k2-21p2+105pk= k2-5p2+113pk
B=p-5k
C=-21p
Oblicz A2+B*C
A²+B+C=(4p+k)²+(p-5k)*(-21p)=(16p²+8pk+k²)+(-21p²+105pk)=16p²+8pk+k²-21p²+105pk=-5p²+113pk+k²