Evaluate
-\left(x-1\right)\left(2x+15\right)
Expand
15-13x-2x^{2}
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6x^{2}-8x+6-8x^{2}-5x+9
To find the opposite of 8x^{2}+5x-9, find the opposite of each term.
-2x^{2}-8x+6-5x+9
Combine 6x^{2} and -8x^{2} to get -2x^{2}.
-2x^{2}-13x+6+9
Combine -8x and -5x to get -13x.
-2x^{2}-13x+15
Add 6 and 9 to get 15.
6x^{2}-8x+6-8x^{2}-5x+9
To find the opposite of 8x^{2}+5x-9, find the opposite of each term.
-2x^{2}-8x+6-5x+9
Combine 6x^{2} and -8x^{2} to get -2x^{2}.
-2x^{2}-13x+6+9
Combine -8x and -5x to get -13x.
-2x^{2}-13x+15
Add 6 and 9 to get 15.
Examples
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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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