bantu jawab sekalian pake jalan nya ya

x² - (p + 1)x + p = 0
ax² - bx + c = 0

x1 + x2 = -b/a = -(-{p + 1})/1 = p + 1
x1x2 =c/a = p

x1² + x2² = 7 + p
(x1 + x2)² - 2x1x2 = 7 + p
(p + 1)² - 2p = 7 + p
p² + 2p + 1 - 2p = 7 + p
p² - p - 6 = 0
(p - 3)(p + 2) = 0
p = 3 atau p = -2

#semoga membantu