Multiple outflows in IRR calculation

What is the correct way to calculate the IRR if there are multiple cash outflows (at different times) which all happened before any inflows?

For example, the cashflows may look like this: -600, -150, 0, -150, 0, 0, 18000

Is it as simple as solving r for 0 = -600 -150/(1+r) - 150/(1+r)^3 + 18000/(1+r)^6 ?

3 Comments
 

Thanks. The additional outflows after the first one could be interpreted as follow-on investments. Mechanistically speaking, ignoring the dates (by assuming equal period between cashflows) is it the right approach?

 

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