Evaluate
28+38x-6x^{2}
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28+38x-6x^{2}
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6\left(-x\right)x+4\left(-x\right)+42x+28
Apply the distributive property by multiplying each term of -x+7 by each term of 6x+4.
-6xx+4\left(-1\right)x+42x+28
Multiply 6 and -1 to get -6.
-6x^{2}+4\left(-1\right)x+42x+28
Multiply x and x to get x^{2}.
-6x^{2}-4x+42x+28
Multiply 4 and -1 to get -4.
-6x^{2}+38x+28
Combine -4x and 42x to get 38x.
6\left(-x\right)x+4\left(-x\right)+42x+28
Apply the distributive property by multiplying each term of -x+7 by each term of 6x+4.
-6xx+4\left(-1\right)x+42x+28
Multiply 6 and -1 to get -6.
-6x^{2}+4\left(-1\right)x+42x+28
Multiply x and x to get x^{2}.
-6x^{2}-4x+42x+28
Multiply 4 and -1 to get -4.
-6x^{2}+38x+28
Combine -4x and 42x to get 38x.
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}