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3 years ago

M=−8r ^2 +11r−6 T=−7r ^2−9r+14 M+T= Answer is: −15r ^2 +2r+8

Mathematics

1 answer:

11Alexandr11 [23.1K]3 years ago

8 0

Answer:

$\large\boxed{M+T=-15r^2+2r+8}$

Step-by-step explanation:

$M=-8r^2+11r-6\\T=-7r^2-9r+14\\\\M+T=?\\\\\text{Substitute:}\\\\M+T=(-8r^2+11r-6)+(-7r^2-9r+14)\\\\M+T=-8r^2+11r-6-7r^2-9r+14\qquad\text{combine like terms}\\\\M+T=(-8r^2-7r^2)+(11r-9r)+(-6+14)\\\\M+T=-15r^2+2r+8$

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Step-by-step explanation:

Given the sequence -4,-6,-8..., in order to get sigma notation to represent the sum of the first seven terms of the sequence, we need to first calculate the sum of the first seven terms of the sequence as shown;

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Required

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