2 years ago

Any help? I'm struggling.

Mathematics

1 answer:

Oksi-84 [34.3K]2 years ago

4 0

Answer:

Step-by-step explanation:

a=-7

r=21/-7=-3

$a_{15}=a r^{n-1}=-7(-3)^{15-1}=-7(-3)^{14}=-33480783$

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Step-by-step explanation:

We use casework on when $3x-9=12$ and when $3x-9=-12$ .

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1 year ago

How do work this out

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We can factor this by using grouping. Take the leading coefficient and multiply it by the constant. In this case we get 5*-7 = -35.

Now we need 2 numbers that add to 2 and multiply to be -35. The numbers are -5 and 7.

So split the 2r into these two terms and group.

(5r^2 - 5r) + (7r - 7)

Factor both groups.

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The factors of (r-1) can be added together to get the answer.

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