Tolong dibantu nomer 6 dan 7 kak ..

6). d < 0

a > 0,b < 0,c > 0
jwbnnya B

7). (4 – 2×1)(4 – 2×2)
2(4+x/2)^2 – 8 (4 + x/2) + 10 = 0
2(16 + 4x + x^2/4) – 32 – 4x + 10 = 0
32 + 8x + x^2/2 – 32 – 4x + 10 = 0
4x + x^2/2 + 10 = 0
================= x 2
8x + x^2 + 20 = 0
x^2 + 8x + 20 = 0
maaf ya sy dptnya segini,slhnya dimana ya?