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= 9x^2 - 15xy - 15xy + 25y^2
= 9x^2 - 30xy + 25y^2
2.U3 = ar^2
U6 = ar^5
ar^5/ar^2 = 96/12
r^3 = 8
r = 2
a . 2^2 = 12
a = 12/4
a = 3
Sn = a(r^n-1)/r-1
= 3(2^10-1)/1
= 3 (1024-1)
= 3 . 1023
= 3.069
= -2xy² = -4xy
maaf ya kalau salah