(3 \times { 21 }^{ 2 } +5 \times 21
Evaluate
1428
Factor
2^{2}\times 3\times 7\times 17
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3\times 441+5\times 21
Calculate 21 to the power of 2 and get 441.
1323+5\times 21
Multiply 3 and 441 to get 1323.
1323+105
Multiply 5 and 21 to get 105.
1428
Add 1323 and 105 to get 1428.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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y = 3x + 4
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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
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}