10y^3+y^2-21y
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To simplify the expression 10y^3 + y^2 - 21y, we can combine like terms if possible. The given expression has three terms: 10y^3, y^2, and -21y.
To combine like terms, we look for terms that have the same variable(s) raised to the same power(s). In this case, we have two terms with y^3 and y^2 as our variables, respectively. Note that the last term, -21y, does not have any like terms.
Combining the like terms:
10y^3 + y^2 - 21y
No further simplification or combination of like terms is possible in this case.
Therefore, the simplified expression is: 10y^3 + y^2 - 21y.