Evaluate
\left(x-3\right)\left(2x+1\right)
Expand
2x^{2}-5x-3
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4x^{2}+4x+1-\left(2x+1\right)\left(x+4\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(2x+1\right)^{2}.
4x^{2}+4x+1-\left(2x^{2}+9x+4\right)
Use the distributive property to multiply 2x+1 by x+4 and combine like terms.
4x^{2}+4x+1-2x^{2}-9x-4
To find the opposite of 2x^{2}+9x+4, find the opposite of each term.
2x^{2}+4x+1-9x-4
Combine 4x^{2} and -2x^{2} to get 2x^{2}.
2x^{2}-5x+1-4
Combine 4x and -9x to get -5x.
2x^{2}-5x-3
Subtract 4 from 1 to get -3.
4x^{2}+4x+1-\left(2x+1\right)\left(x+4\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(2x+1\right)^{2}.
4x^{2}+4x+1-\left(2x^{2}+9x+4\right)
Use the distributive property to multiply 2x+1 by x+4 and combine like terms.
4x^{2}+4x+1-2x^{2}-9x-4
To find the opposite of 2x^{2}+9x+4, find the opposite of each term.
2x^{2}+4x+1-9x-4
Combine 4x^{2} and -2x^{2} to get 2x^{2}.
2x^{2}-5x+1-4
Combine 4x and -9x to get -5x.
2x^{2}-5x-3
Subtract 4 from 1 to get -3.
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}