Evaluate
\left(x-21\right)\left(x-1\right)
Expand
x^{2}-22x+21
Graph
Share
Copied to clipboard
9-6x+x^{2}-4\left(-1\right)\left(3-4x\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3-x\right)^{2}.
9-6x+x^{2}-\left(-4\left(3-4x\right)\right)
Multiply 4 and -1 to get -4.
9-6x+x^{2}+4\left(3-4x\right)
The opposite of -4\left(3-4x\right) is 4\left(3-4x\right).
9-6x+x^{2}+12-16x
Use the distributive property to multiply 4 by 3-4x.
21-6x+x^{2}-16x
Add 9 and 12 to get 21.
21-22x+x^{2}
Combine -6x and -16x to get -22x.
9-6x+x^{2}-4\left(-1\right)\left(3-4x\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3-x\right)^{2}.
9-6x+x^{2}-\left(-4\left(3-4x\right)\right)
Multiply 4 and -1 to get -4.
9-6x+x^{2}+4\left(3-4x\right)
The opposite of -4\left(3-4x\right) is 4\left(3-4x\right).
9-6x+x^{2}+12-16x
Use the distributive property to multiply 4 by 3-4x.
21-6x+x^{2}-16x
Add 9 and 12 to get 21.
21-22x+x^{2}
Combine -6x and -16x to get -22x.
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}