Evaluate
\left(a-2b\right)\left(2a+b\right)
Expand
2a^{2}-3ab-2b^{2}
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2a^{2}+ab-4ba-2b^{2}
Apply the distributive property by multiplying each term of a-2b by each term of 2a+b.
2a^{2}-3ab-2b^{2}
Combine ab and -4ba to get -3ab.
2a^{2}+ab-4ba-2b^{2}
Apply the distributive property by multiplying each term of a-2b by each term of 2a+b.
2a^{2}-3ab-2b^{2}
Combine ab and -4ba to get -3ab.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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4 \sin \theta \cos \theta = 2 \sin \theta
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y = 3x + 4
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Matrix
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Simultaneous equation
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Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
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Limits
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