Evaluate
\left(2a-b-4\right)\left(6a-3b-7\right)
Expand
12a^{2}-12ab-38a+3b^{2}+19b+28
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3\left(4a^{2}-4ab+b^{2}\right)-19\left(2a-b\right)+28
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(2a-b\right)^{2}.
12a^{2}-12ab+3b^{2}-19\left(2a-b\right)+28
Use the distributive property to multiply 3 by 4a^{2}-4ab+b^{2}.
12a^{2}-12ab+3b^{2}-38a+19b+28
Use the distributive property to multiply -19 by 2a-b.
3\left(4a^{2}-4ab+b^{2}\right)-19\left(2a-b\right)+28
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(2a-b\right)^{2}.
12a^{2}-12ab+3b^{2}-19\left(2a-b\right)+28
Use the distributive property to multiply 3 by 4a^{2}-4ab+b^{2}.
12a^{2}-12ab+3b^{2}-38a+19b+28
Use the distributive property to multiply -19 by 2a-b.
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}