( \quad - 2 a \leq - 4
Solve for a
a\geq 2
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a\geq \frac{-4}{-2}
Divide both sides by -2. Since -2 is negative, the inequality direction is changed.
a\geq 2
Divide -4 by -2 to get 2.
Examples
Quadratic equation
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Trigonometry
4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
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Matrix
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\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
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Limits
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