( - 0,9 a - 0,1 ) ^ { 2 }
Evaluate
\left(\frac{9a+1}{10}\right)^{2}
Expand
\frac{81a^{2}}{100}+\frac{9a}{50}+0,01
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0,81a^{2}+0,18a+0,01
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(-0,9a-0,1\right)^{2}.
0,81a^{2}+0,18a+0,01
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(-0,9a-0,1\right)^{2}.
Examples
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\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]
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Limits
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