Multiply the single term $y^2$ by each term of the polynomial $\left(2x-y\right)$
$2xy^2-y\cdot y^2$
2
When multiplying exponents with same base you can add the exponents: $-y\cdot y^2$
$2xy^2-y^{3}$
Final answer to the problem
$2xy^2-y^{3}$
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The simplification of algebraic expressions consists in rewriting a long and complex expression in an equivalent, but much simpler expression. This simplification can be accomplished through the combined use of arithmetic and algebra rules.