Evaluate
2\left(61+a-2a^{2}\right)
Expand
122+2a-4a^{2}
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2a+121-\left(2a+1\right)\left(-1+2a\right)
Calculate 11 to the power of 2 and get 121.
2a+121-\left(-2a+4a^{2}-1+2a\right)
Apply the distributive property by multiplying each term of 2a+1 by each term of -1+2a.
2a+121-\left(4a^{2}-1\right)
Combine -2a and 2a to get 0.
2a+121-4a^{2}-\left(-1\right)
To find the opposite of 4a^{2}-1, find the opposite of each term.
2a+121-4a^{2}+1
The opposite of -1 is 1.
2a+122-4a^{2}
Add 121 and 1 to get 122.
2a+121-\left(2a+1\right)\left(-1+2a\right)
Calculate 11 to the power of 2 and get 121.
2a+121-\left(-2a+4a^{2}-1+2a\right)
Apply the distributive property by multiplying each term of 2a+1 by each term of -1+2a.
2a+121-\left(4a^{2}-1\right)
Combine -2a and 2a to get 0.
2a+121-4a^{2}-\left(-1\right)
To find the opposite of 4a^{2}-1, find the opposite of each term.
2a+121-4a^{2}+1
The opposite of -1 is 1.
2a+122-4a^{2}
Add 121 and 1 to get 122.
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}