Evaluate
\left(5x-7\right)^{2}
Expand
25x^{2}-70x+49
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25x^{2}-40x+16-6\left(5x-4\right)+9
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(5x-4\right)^{2}.
25x^{2}-40x+16-30x+24+9
Use the distributive property to multiply -6 by 5x-4.
25x^{2}-70x+16+24+9
Combine -40x and -30x to get -70x.
25x^{2}-70x+40+9
Add 16 and 24 to get 40.
25x^{2}-70x+49
Add 40 and 9 to get 49.
25x^{2}-40x+16-6\left(5x-4\right)+9
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(5x-4\right)^{2}.
25x^{2}-40x+16-30x+24+9
Use the distributive property to multiply -6 by 5x-4.
25x^{2}-70x+16+24+9
Combine -40x and -30x to get -70x.
25x^{2}-70x+40+9
Add 16 and 24 to get 40.
25x^{2}-70x+49
Add 40 and 9 to get 49.
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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699 * 533
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}