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

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d x/(cos(x))

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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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fatoração 9x²−12x+4

Solution

(3x−2)²

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9x²−12x+4

Rewrite in the form of a²+2ab+b²:

9x²=(3x)²

4=2²

−12x=−2· 3x· 2

=(3x)²−2· 3x· 2+2²

Aplique a fórmula do quadrado perfeito: a²−2ab+b²=(a−b)²

(3x)²−2· 3x· 2+2²=(3x−2)²

=(3x−2)²

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