Evaluate
\frac{5k}{2}-\frac{91}{45}
Expand
\frac{5k}{2}-\frac{91}{45}
Share
Copied to clipboard
-\frac{1}{45}+\frac{4+1}{2}k-2
Multiply 2 and 2 to get 4.
-\frac{1}{45}+\frac{5}{2}k-2
Add 4 and 1 to get 5.
-\frac{1}{45}+\frac{5}{2}k-\frac{90}{45}
Convert 2 to fraction \frac{90}{45}.
\frac{-1-90}{45}+\frac{5}{2}k
Since -\frac{1}{45} and \frac{90}{45} have the same denominator, subtract them by subtracting their numerators.
-\frac{91}{45}+\frac{5}{2}k
Subtract 90 from -1 to get -91.
-\frac{1}{45}+\frac{4+1}{2}k-2
Multiply 2 and 2 to get 4.
-\frac{1}{45}+\frac{5}{2}k-2
Add 4 and 1 to get 5.
-\frac{1}{45}+\frac{5}{2}k-\frac{90}{45}
Convert 2 to fraction \frac{90}{45}.
\frac{-1-90}{45}+\frac{5}{2}k
Since -\frac{1}{45} and \frac{90}{45} have the same denominator, subtract them by subtracting their numerators.
-\frac{91}{45}+\frac{5}{2}k
Subtract 90 from -1 to get -91.
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
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}