x^4-20 x^2+64=0

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

☐²

x^☐

√☐

^□√☐

□□

log_□

θ

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∫

ddx

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

simplify solve for inverse tangent line

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x⁴−20x²+64=0

Solution

x=4, x=−4, x=2, x=−2

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x⁴−20x²+64=0

Rewrite the equation with u=x² and u²=x⁴

u²−20u+64=0

Solve u²−20u+64=0: u=16, u=4

u=16, u=4

Substitute back u=x², solve for x

Solve x²=16: x=4, x=−4

Solve x²=4: x=2, x=−2

The solutions are

x=4, x=−4, x=2, x=−2

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

x^4-20 x^2+64=0

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