Evaluate
\frac{y\left(7x+4y\right)}{2}
Expand
\frac{7xy}{2}+2y^{2}
Quiz
Algebra
5 problems similar to:
( 2 x + y ) ^ { 2 } - ( 2 x + y ) ( 2 x - y ) - \frac { 1 } { 2 } x y
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4x^{2}+4xy+y^{2}-\left(2x+y\right)\left(2x-y\right)-\frac{1}{2}xy
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(2x+y\right)^{2}.
4x^{2}+4xy+y^{2}-\left(\left(2x\right)^{2}-y^{2}\right)-\frac{1}{2}xy
Consider \left(2x+y\right)\left(2x-y\right). Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
4x^{2}+4xy+y^{2}-\left(2^{2}x^{2}-y^{2}\right)-\frac{1}{2}xy
Expand \left(2x\right)^{2}.
4x^{2}+4xy+y^{2}-\left(4x^{2}-y^{2}\right)-\frac{1}{2}xy
Calculate 2 to the power of 2 and get 4.
4x^{2}+4xy+y^{2}-4x^{2}+y^{2}-\frac{1}{2}xy
To find the opposite of 4x^{2}-y^{2}, find the opposite of each term.
4xy+y^{2}+y^{2}-\frac{1}{2}xy
Combine 4x^{2} and -4x^{2} to get 0.
4xy+2y^{2}-\frac{1}{2}xy
Combine y^{2} and y^{2} to get 2y^{2}.
\frac{7}{2}xy+2y^{2}
Combine 4xy and -\frac{1}{2}xy to get \frac{7}{2}xy.
4x^{2}+4xy+y^{2}-\left(2x+y\right)\left(2x-y\right)-\frac{1}{2}xy
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(2x+y\right)^{2}.
4x^{2}+4xy+y^{2}-\left(\left(2x\right)^{2}-y^{2}\right)-\frac{1}{2}xy
Consider \left(2x+y\right)\left(2x-y\right). Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
4x^{2}+4xy+y^{2}-\left(2^{2}x^{2}-y^{2}\right)-\frac{1}{2}xy
Expand \left(2x\right)^{2}.
4x^{2}+4xy+y^{2}-\left(4x^{2}-y^{2}\right)-\frac{1}{2}xy
Calculate 2 to the power of 2 and get 4.
4x^{2}+4xy+y^{2}-4x^{2}+y^{2}-\frac{1}{2}xy
To find the opposite of 4x^{2}-y^{2}, find the opposite of each term.
4xy+y^{2}+y^{2}-\frac{1}{2}xy
Combine 4x^{2} and -4x^{2} to get 0.
4xy+2y^{2}-\frac{1}{2}xy
Combine y^{2} and y^{2} to get 2y^{2}.
\frac{7}{2}xy+2y^{2}
Combine 4xy and -\frac{1}{2}xy to get \frac{7}{2}xy.
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}