Evaluate
\left(8-3x\right)\left(7x+2\right)
Expand
16+50x-21x^{2}
Graph
Share
Copied to clipboard
4x^{2}+20x+25-\left(5x-3\right)^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(2x+5\right)^{2}.
4x^{2}+20x+25-\left(25x^{2}-30x+9\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(5x-3\right)^{2}.
4x^{2}+20x+25-25x^{2}+30x-9
To find the opposite of 25x^{2}-30x+9, find the opposite of each term.
-21x^{2}+20x+25+30x-9
Combine 4x^{2} and -25x^{2} to get -21x^{2}.
-21x^{2}+50x+25-9
Combine 20x and 30x to get 50x.
-21x^{2}+50x+16
Subtract 9 from 25 to get 16.
4x^{2}+20x+25-\left(5x-3\right)^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(2x+5\right)^{2}.
4x^{2}+20x+25-\left(25x^{2}-30x+9\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(5x-3\right)^{2}.
4x^{2}+20x+25-25x^{2}+30x-9
To find the opposite of 25x^{2}-30x+9, find the opposite of each term.
-21x^{2}+20x+25+30x-9
Combine 4x^{2} and -25x^{2} to get -21x^{2}.
-21x^{2}+50x+25-9
Combine 20x and 30x to get 50x.
-21x^{2}+50x+16
Subtract 9 from 25 to get 16.
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}