Evaluate
\left(x+y\right)\left(x+3y\right)
Expand
x^{2}+4xy+3y^{2}
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x^{2}+xy+3yx+3y^{2}
Apply the distributive property by multiplying each term of x+3y by each term of x+y.
x^{2}+4xy+3y^{2}
Combine xy and 3yx to get 4xy.
x^{2}+xy+3yx+3y^{2}
Apply the distributive property by multiplying each term of x+3y by each term of x+y.
x^{2}+4xy+3y^{2}
Combine xy and 3yx to get 4xy.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
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Matrix
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Simultaneous equation
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Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
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Limits
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