Evaluate
x\left(13x-28\right)
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13x^{2}-28x
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12x^{2}-21x+x\left(x-7\right)
Use the distributive property to multiply 3x by 4x-7.
12x^{2}-21x+x^{2}-7x
Use the distributive property to multiply x by x-7.
13x^{2}-21x-7x
Combine 12x^{2} and x^{2} to get 13x^{2}.
13x^{2}-28x
Combine -21x and -7x to get -28x.
12x^{2}-21x+x\left(x-7\right)
Use the distributive property to multiply 3x by 4x-7.
12x^{2}-21x+x^{2}-7x
Use the distributive property to multiply x by x-7.
13x^{2}-21x-7x
Combine 12x^{2} and x^{2} to get 13x^{2}.
13x^{2}-28x
Combine -21x and -7x to get -28x.
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
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