Expand
4x^{2}+31xy+21y^{2}
Evaluate
\left(x+7y\right)\left(4x+3y\right)
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4x^{2}+3xy+28yx+21y^{2}
Apply the distributive property by multiplying each term of x+7y by each term of 4x+3y.
4x^{2}+31xy+21y^{2}
Combine 3xy and 28yx to get 31xy.
4x^{2}+3xy+28yx+21y^{2}
Apply the distributive property by multiplying each term of x+7y by each term of 4x+3y.
4x^{2}+31xy+21y^{2}
Combine 3xy and 28yx to get 31xy.
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