Answer:
-z⁵¹
Explanation:
z⁴⁹ + z⁵⁰ + z⁵¹ + z⁵² + z⁵³
z⁴⁹ + z⁵⁰ + z⁵¹ + z⁵¹ + z⁵² + z⁵³ − z⁵¹
z⁴⁹ (1 + z + z²) + z⁵¹ (1 + z + z²) − z⁵¹
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