Evaluate
21y^{5}+42y^{7}-56y^{8}
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21y^{5}+42y^{7}-56y^{8}
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\left(42y^{2}-56y^{3}+21\right)y^{5}
Use the distributive property to multiply 6y^{2}-8y^{3}+3 by 7.
42y^{7}-56y^{8}+21y^{5}
Use the distributive property to multiply 42y^{2}-56y^{3}+21 by y^{5}.
\left(42y^{2}-56y^{3}+21\right)y^{5}
Use the distributive property to multiply 6y^{2}-8y^{3}+3 by 7.
42y^{7}-56y^{8}+21y^{5}
Use the distributive property to multiply 42y^{2}-56y^{3}+21 by y^{5}.
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