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4 years ago

(5s-6)(3s+2) please just give me the answer I have to turn it in today

Mathematics

1 answer:

alexandr1967 [171]4 years ago

5 0

Answer:

The answer is -2

Step-by-step explanation:

you subtract common numbers, so:

5s - 3s = 2s

Then,

-6 + 2 = -4

You would then get

2s - 4

divide -4 by 2 which is -2

and your answer is s = -2

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Let

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and subtracting this from $S_n$ gives

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Solving for r by substitution, we have

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$\dfrac2{3(1-r)^2} = \dfrac1{(1-r)(1+r)}$

We've already confirmed r ≠ 1, so we can simplify this to

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$\dfrac a{1-r} = \dfrac a{1-\frac15} = 15 \implies a = 12$

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$ar^3 + ar^4 + ar^6 + \cdots = 15 - a - ar - ar^2 = \boxed{\dfrac3{25}}$

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