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Step-by-step explanation:
Use the distributive property.
8x3 + 20x2 + 20x for 4x's distribution.
-6x2 - 15x - 15 for -3's distribution.
Add these together, and add/subtract like terms. You're left with 8x3 + 14x2 + 5x - 15.
see explanation
step-by-step explanation:
since the sequence is geometric there is a common ratio r between consecutive terms, that is
r = 4 Γ· - 2 = - 2
r = - 8 Γ· 4 = - 2
r = 16 Γ· 8 = - 2
the next term - 13 must be incorrect as it should be - 32 for the sequence to be geometric.
the first 4 terms are therefore geometric with common ratio r = - 2
i dont know sorry