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-x=2
x=-2
2x2-8x-p=0
4-8(-2)-p=0
4+16-p=0
x₁-x₂ = √D/a
D = b²-4ac
= 64-4.2.(-p)
= 64+8p
x₁-x₂ = 2
√(64+8p) / 2 = 2
√(64+8p) = 4 --> kuadratkan kedua ruas
64+8p = 16
8p = 16-64
8p = -48
p = -6
semoga membantu ya :)