bisa tolong jawab soal ini..? no 3,5,6,7,8,9,12

7) 3x²-(p+2)x + (p-5)= 0

Kebalikan x1 = 1/x2

x1.x2 = 1
c/a = 1
c/3 = 1
c = 3
p-5 = 3
p = 8

9)x²-6x-2= 0
α+β = 6
αβ = -2

x1+x2 = (α-2)+(β-2)
= α+β -4
= 6-4
= 2

x1.x2 = (α-2)(β-2)
= αβ-2(α+β)+4
= -2-2.6 + 4
= -10

pk : x² - (x1+x2) x + x1.x2 = 0
x² - 2x - 10 = 0


12)x²+4x + (a-4)
x1.x2 = a-4
1.3. = a-4
a = 3+4
= 7