Evaluate
x^{2}+3x-21
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x^{2}+3x-21
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2x^{2}-x-15-x^{2}+4x-6
Use the distributive property to multiply 2x+5 by x-3 and combine like terms.
x^{2}-x-15+4x-6
Combine 2x^{2} and -x^{2} to get x^{2}.
x^{2}+3x-15-6
Combine -x and 4x to get 3x.
x^{2}+3x-21
Subtract 6 from -15 to get -21.
2x^{2}-x-15-x^{2}+4x-6
Use the distributive property to multiply 2x+5 by x-3 and combine like terms.
x^{2}-x-15+4x-6
Combine 2x^{2} and -x^{2} to get x^{2}.
x^{2}+3x-15-6
Combine -x and 4x to get 3x.
x^{2}+3x-21
Subtract 6 from -15 to get -21.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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y = 3x + 4
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Matrix
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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}