Solve for r
r\geq -1
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4r\geq 4-8
Subtract 8 from both sides.
4r\geq -4
Subtract 8 from 4 to get -4.
r\geq \frac{-4}{4}
Divide both sides by 4. Since 4 is positive, the inequality direction remains the same.
r\geq -1
Divide -4 by 4 to get -1.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
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4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
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699 * 533
Matrix
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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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