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a = 6.(1-r)
ar²/(1-r) = 2
ar² = 2.(1-r)
ar²/a = 2.(1-r)/6.(1-r)
r² = 1/3
r = 1/√3 atau r = -1/√3....opsi D
7. y = x² - 2x + m + 3; x = p dan y = q
dy/dx = 2x - 2
0 = 2x - 2
2x = 2
x = 1, maka p= 1 dan q= m+2, dan r= (m+2)/6
Sn = a/(1-r)
9 = 3/(1-((m+2)/6))
9 = 18/(6-m-2)
4-m = 2
m = 2....opsi C
8. a/(1-r) = (3/2).a + ar/(1-r²)
1/(1-r) = (3/2) + r/(1-r²)
1/(1-r) - r/(1-r²) = (3/2)
1+r - r = (3/2)(1-r²)
1 = (3/2)(1-r²)
2/3 = 1-r²
r² = 1-(2/3)
r² = 1/3...........opsi C