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Verified answer
X² + 2px + 16 = 0Karena x1=x2= x
maka
x1*x2 = 16
x² = 16
x = +/- 4
Digunakan -4 agar pers = 0
Maka
(x-4)² = 0
x² + 2(-4)x + 16 = p
Maka nilai p = -4