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15b-12a
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15b-12a
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-3a-\left(2a-\left(-7a\right)-2b-4b\right)+9b
To find the opposite of -7a+2b, find the opposite of each term.
-3a-\left(2a+7a-2b-4b\right)+9b
The opposite of -7a is 7a.
-3a-\left(9a-2b-4b\right)+9b
Combine 2a and 7a to get 9a.
-3a-\left(9a-6b\right)+9b
Combine -2b and -4b to get -6b.
-3a-9a-\left(-6b\right)+9b
To find the opposite of 9a-6b, find the opposite of each term.
-3a-9a+6b+9b
The opposite of -6b is 6b.
-12a+6b+9b
Combine -3a and -9a to get -12a.
-12a+15b
Combine 6b and 9b to get 15b.
-3a-\left(2a-\left(-7a\right)-2b-4b\right)+9b
To find the opposite of -7a+2b, find the opposite of each term.
-3a-\left(2a+7a-2b-4b\right)+9b
The opposite of -7a is 7a.
-3a-\left(9a-2b-4b\right)+9b
Combine 2a and 7a to get 9a.
-3a-\left(9a-6b\right)+9b
Combine -2b and -4b to get -6b.
-3a-9a-\left(-6b\right)+9b
To find the opposite of 9a-6b, find the opposite of each term.
-3a-9a+6b+9b
The opposite of -6b is 6b.
-12a+6b+9b
Combine -3a and -9a to get -12a.
-12a+15b
Combine 6b and 9b to get 15b.
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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}