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9a^{2}+9a-15
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9a^{2}+9a-15
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9a^{2}-12a+4+7\left(3a-2\right)-5
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(3a-2\right)^{2}.
9a^{2}-12a+4+21a-14-5
Use the distributive property to multiply 7 by 3a-2.
9a^{2}+9a+4-14-5
Combine -12a and 21a to get 9a.
9a^{2}+9a-10-5
Subtract 14 from 4 to get -10.
9a^{2}+9a-15
Subtract 5 from -10 to get -15.
9a^{2}-12a+4+7\left(3a-2\right)-5
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(3a-2\right)^{2}.
9a^{2}-12a+4+21a-14-5
Use the distributive property to multiply 7 by 3a-2.
9a^{2}+9a+4-14-5
Combine -12a and 21a to get 9a.
9a^{2}+9a-10-5
Subtract 14 from 4 to get -10.
9a^{2}+9a-15
Subtract 5 from -10 to get -15.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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y = 3x + 4
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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}