Solve for x
x\in (-\infty,-7]\cup [7,\infty)
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x^{2}\geq 49
Add 49 to both sides.
x^{2}\geq 7^{2}
Calculate the square root of 49 and get 7. Rewrite 49 as 7^{2}.
|x|\geq 7
Inequality holds for |x|\geq 7.
x\leq -7\text{; }x\geq 7
Rewrite |x|\geq 7 as x\leq -7\text{; }x\geq 7.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometry
4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
699 * 533
Matrix
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
Simultaneous equation
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
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