Expand
y^{3}+10y^{2}+21y
Evaluate
y\left(y+3\right)\left(y+7\right)
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\left(y^{2}+3y\right)\left(y+7\right)
Use the distributive property to multiply y by y+3.
y^{3}+7y^{2}+3y^{2}+21y
Apply the distributive property by multiplying each term of y^{2}+3y by each term of y+7.
y^{3}+10y^{2}+21y
Combine 7y^{2} and 3y^{2} to get 10y^{2}.
\left(y^{2}+3y\right)\left(y+7\right)
Use the distributive property to multiply y by y+3.
y^{3}+7y^{2}+3y^{2}+21y
Apply the distributive property by multiplying each term of y^{2}+3y by each term of y+7.
y^{3}+10y^{2}+21y
Combine 7y^{2} and 3y^{2} to get 10y^{2}.
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