Evaluate
\left(r-8\right)\left(5r-7\right)
Expand
5r^{2}-47r+56
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5r^{2}-40r-7r+56
Apply the distributive property by multiplying each term of 5r-7 by each term of r-8.
5r^{2}-47r+56
Combine -40r and -7r to get -47r.
5r^{2}-40r-7r+56
Apply the distributive property by multiplying each term of 5r-7 by each term of r-8.
5r^{2}-47r+56
Combine -40r and -7r to get -47r.
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
\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
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Limits
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