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\frac{3x-9+h-3x-\left(-9\right)}{h}
To find the opposite of 3x-9, find the opposite of each term.
\frac{3x-9+h-3x+9}{h}
The opposite of -9 is 9.
\frac{-9+h+9}{h}
Combine 3x and -3x to get 0.
\frac{h}{h}
Add -9 and 9 to get 0.
1
Cancel out h in both numerator and denominator.
Examples
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y = 3x + 4
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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
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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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