Evaluate
-4\left(x-2\right)\left(x+1\right)
Expand
8+4x-4x^{2}
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9-\left(4x^{2}-4x+1\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2x-1\right)^{2}.
9-4x^{2}+4x-1
To find the opposite of 4x^{2}-4x+1, find the opposite of each term.
8-4x^{2}+4x
Subtract 1 from 9 to get 8.
9-\left(4x^{2}-4x+1\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2x-1\right)^{2}.
9-4x^{2}+4x-1
To find the opposite of 4x^{2}-4x+1, find the opposite of each term.
8-4x^{2}+4x
Subtract 1 from 9 to get 8.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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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
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Limits
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