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9x^{2}-13x-3
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9x^{2}-13x-3
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9x^{2}-6x+1-\left(7x+4\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3x-1\right)^{2}.
9x^{2}-6x+1-7x-4
To find the opposite of 7x+4, find the opposite of each term.
9x^{2}-13x+1-4
Combine -6x and -7x to get -13x.
9x^{2}-13x-3
Subtract 4 from 1 to get -3.
9x^{2}-6x+1-\left(7x+4\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3x-1\right)^{2}.
9x^{2}-6x+1-7x-4
To find the opposite of 7x+4, find the opposite of each term.
9x^{2}-13x+1-4
Combine -6x and -7x to get -13x.
9x^{2}-13x-3
Subtract 4 from 1 to get -3.
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}