Hello from MrBillDoesMath!
Answer:
a(n) = -3n , n>= 1
Discussion:
a(1) = -3
a(2) = -6
a(3) = -9
a(4) = -12
The pattern looks like a(n) = -3n
Thank you,
MrB
A-6= 8-(9+a)
Distribute -1
a-6= 8-9-a
Combine like terms
a-6= -1-a
Add a to both sides
2a-6= -1
Add 6 to both sides
2a= 5
Divide both sides by 2
a= 5/2
Final answer: a=5/2
(-2d^2+s)(5d^2-6s)
= (-2d^2*5d^2 + s*5d^2 -2d^2*-6s + s*-6s
= -10d^4 + 5sd^2 + 12sd^2 - 6s^2
=-10d^2 + 17sd^2 - 6s^2
This is the final result
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