The product of the given expression is z⁴
Indices expression.
Given the following expression
z^-11 × z^'15
Note that the base of the products are equal. since the base are equal, we will add the exponents according yo the product law of Indices
z^-11 × z^'15 = z¹⁵‐¹¹
Take the sum of the exponent to have;
z^-11 × z^'15 = ź⁴
Hence the product of the given expression is z⁴
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