Solve equation by using the quadratic formula. List the solutions, separated by commas.

`2z^2-z-9 = 0`

`z` =  

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Box 1: Enter your answer as a list of values separated by commas: Example: -4, 3, 2
Enter each value as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for Does Not Exist, oo for Infinity