2² + 2p + 40 = 0
4 + 2p + 40 = 0
2p = - 44
p = - 44 : 2
p = - 22
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2² + 2p + 40 = 0
4 + 2p + 40 = 0
2p = - 44
p = - 44 : 2
p = - 22