Solve for x
x\in (-\infty,-4]\cup [4,\infty)
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x^{2}\geq 4^{2}
Calculate the square root of 16 and get 4. Rewrite 16 as 4^{2}.
|x|\geq 4
Inequality holds for |x|\geq 4.
x\leq -4\text{; }x\geq 4
Rewrite |x|\geq 4 as x\leq -4\text{; }x\geq 4.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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4 \sin \theta \cos \theta = 2 \sin \theta
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y = 3x + 4
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Matrix
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Simultaneous equation
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
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\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
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Limits
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