Evaluate
\left(a+4\right)\left(x+7\right)
Expand
ax+4x+7a+28
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x+7+3ax+21a-2a\left(x+7\right)+3\left(x+7\right)
Apply the distributive property by multiplying each term of 1+3a by each term of x+7.
x+7+3ax+21a-2a\left(x+7\right)+3x+21
Use the distributive property to multiply 3 by x+7.
x+7+3ax+21a-2ax-14a+3x+21
Use the distributive property to multiply -2a by x+7.
x+7+ax+21a-14a+3x+21
Combine 3ax and -2ax to get ax.
x+7+ax+7a+3x+21
Combine 21a and -14a to get 7a.
4x+7+ax+7a+21
Combine x and 3x to get 4x.
4x+28+ax+7a
Add 7 and 21 to get 28.
x+7+3ax+21a-2a\left(x+7\right)+3\left(x+7\right)
Apply the distributive property by multiplying each term of 1+3a by each term of x+7.
x+7+3ax+21a-2a\left(x+7\right)+3x+21
Use the distributive property to multiply 3 by x+7.
x+7+3ax+21a-2ax-14a+3x+21
Use the distributive property to multiply -2a by x+7.
x+7+ax+21a-14a+3x+21
Combine 3ax and -2ax to get ax.
x+7+ax+7a+3x+21
Combine 21a and -14a to get 7a.
4x+7+ax+7a+21
Combine x and 3x to get 4x.
4x+28+ax+7a
Add 7 and 21 to get 28.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometry
4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
699 * 533
Matrix
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
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}