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範囲 x^2-36x-20

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

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ddx

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

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因数 x²+6x+9

Solution

(x+3)²

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x²+6x+9

a²+2ab+b² の形式で書き直す:

9=3²

6x=2x· 3

=x²+2x· 3+3²

完全平方式を適用する: a²+2ab+b²=(a+b)²

x²+2x· 3+3²=(x+3)²

=(x+3)²

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−▭▭	<	7	8	9	÷	`AC`
+▭▭	>	4	5	6	×	☐☐☐
×▭▭	(	1	2	3	−	`x`
▭ \|▭	)	.	0	=	+	`y`

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範囲 x^2-36x-20

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