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p + q = -b/a = 7/2
pq = c/a = 1/2
p² + q² = (p+q)² - 2pq
= (7/2)² - 2(1/2)
= 49/4 - 1
= 45/4 = 11 1/4
D.
6.
PKB
x² - (penjumlahan akar)x + (perkalian akar) = 0
penjumlahan akar = 2 + √3 + 2 - √3 = 4
perkalian akar = (2+√3)(2-√3) = 2 - 3 = -1
masukkan :
x² - (4)x + (-1) = 0
x² - 4x - 1 = 0
B.
7.
a = -3 < 0
kurva terbuka k bawah
D = 4 + 48 = 52 > 0
kurva memotong sumbu x
yang paling sesuai adalah kurva E.
JB : E,