Evaluate
\left(4j+7k+3i\right)\left(7j+9k+2i\right)
Expand
28j^{2}+85jk+29ij+63k^{2}+41ik-6
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-6+21ij+27ik+8ij+28j^{2}+36jk+14ik+49kj+63k^{2}
Apply the distributive property by multiplying each term of 3i+4j+7k by each term of 2i+7j+9k.
-6+29ij+27ik+28j^{2}+36jk+14ik+49kj+63k^{2}
Combine 21ij and 8ij to get 29ij.
-6+29ij+41ik+28j^{2}+36jk+49kj+63k^{2}
Combine 27ik and 14ik to get 41ik.
-6+29ij+41ik+28j^{2}+85jk+63k^{2}
Combine 36jk and 49kj to get 85jk.
-6+21ij+27ik+8ij+28j^{2}+36jk+14ik+49kj+63k^{2}
Apply the distributive property by multiplying each term of 3i+4j+7k by each term of 2i+7j+9k.
-6+29ij+27ik+28j^{2}+36jk+14ik+49kj+63k^{2}
Combine 21ij and 8ij to get 29ij.
-6+29ij+41ik+28j^{2}+36jk+49kj+63k^{2}
Combine 27ik and 14ik to get 41ik.
-6+29ij+41ik+28j^{2}+85jk+63k^{2}
Combine 36jk and 49kj to get 85jk.
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}