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`x`²	`x`^□	log_□	√☐	^□√☐	≤	≥	□□	·	÷	`x`^◦	π
(☐)^′	`ddx`	∂∂`x`	∫	∫_□^□	lim	∑	∞	`θ`	(`f` ◦ `g`)	`f`(`x`)

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逆 3x^4-2x^2

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`x`²	`x`^□	log_□	√☐	^□√☐	≤	≥	□□	·	÷	`x`^◦	π
(☐)^′	`ddx`	∂∂`x`	∫	∫_□^□	lim	∑	∞	`θ`	(`f` ◦ `g`)	`f`(`x`)

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≥	≤	·	÷	`x`^◦	(☐)	\|☐\|	(`f` ◦ `g`)	`f`(`x`)	ln	`e`^☐
(☐)^′	∂∂`x`	∫_□^□	lim	∑	sin	cos	tan	cot	csc	sec

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数列の種類 a_n+1=−3a_n, a₁=8

Solution

等比数列: r=−3, a_n=8(−3)ⁿ⁻¹

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Solution steps

One step at a time

a₁=8, a_n+1=−3a_n

等比数列

等比数列には,定率 r が含まれており,a_n=a₁·r^\:によって定義されるn−1

公比を求める: r=−3

等比数列

r=−3

n 番めの項を求める: a_n=8(−3)ⁿ⁻¹

等比数列: r=−3, a_n=8(−3)ⁿ⁻¹

Solve instead

初項 a_n+1=−3a_n, a₁=8

n項 a_n+1=−3a_n, a₁=8

next term a_n+1=−3a_n, a₁=8

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