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P=b²
P=(5a-5 )²=25a²-50a+25=25(a²-2a+1)
a=5a-5
Pp=(5a-5)²=(5a-5)×(5a-5)=25a²-25a-25a+25=25a²-50a+25
P=(5a-5)²
P=25a²-50a+25