Evaluate
51x^{2}+31x-5
Expand
51x^{2}+31x-5
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2x^{2}+3x-9+49x^{2}+28x+4
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(7x+2\right)^{2}.
51x^{2}+3x-9+28x+4
Combine 2x^{2} and 49x^{2} to get 51x^{2}.
51x^{2}+31x-9+4
Combine 3x and 28x to get 31x.
51x^{2}+31x-5
Add -9 and 4 to get -5.
2x^{2}+3x-9+49x^{2}+28x+4
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(7x+2\right)^{2}.
51x^{2}+3x-9+28x+4
Combine 2x^{2} and 49x^{2} to get 51x^{2}.
51x^{2}+31x-9+4
Combine 3x and 28x to get 31x.
51x^{2}+31x-5
Add -9 and 4 to get -5.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
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}