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4 = 2p²-7
4+7 = 2p²
11 = 2p²
p² = 11/2
p²=5,5
p=√5,5
f(p)=2p^2 - 7 = 4
2p^2=4+7
2p^2=11
p^2=11/2
p = √11/2