Question

Simplify:
$- {z}^{2} + 13 {z}^{2} - 5z + 7 {z}^{3} - 15z$
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Answer 1

Step-by-step explanation:

$- {x}^{2} + {13x}^{2} - 5x + {7x}^{3} - 15x \\ = {7x}^{3} + {12x}^{2} - 20x$

I have taken x in terms of z.