Evaluate
-a^{2}+20a-53
Expand
-a^{2}+20a-53
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16a-49-\left(1a-2\right)^{2}
Calculate 7 to the power of 2 and get 49.
16a-49-\left(a^{2}-4a+4\right)
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(1a-2\right)^{2}.
16a-49-a^{2}+4a-4
To find the opposite of a^{2}-4a+4, find the opposite of each term.
20a-49-a^{2}-4
Combine 16a and 4a to get 20a.
20a-53-a^{2}
Subtract 4 from -49 to get -53.
16a-49-\left(1a-2\right)^{2}
Calculate 7 to the power of 2 and get 49.
16a-49-\left(a^{2}-4a+4\right)
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(1a-2\right)^{2}.
16a-49-a^{2}+4a-4
To find the opposite of a^{2}-4a+4, find the opposite of each term.
20a-49-a^{2}-4
Combine 16a and 4a to get 20a.
20a-53-a^{2}
Subtract 4 from -49 to get -53.
Examples
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{ 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}