Physics

What do I have wrong in here?

A stone is thrown vertically upward at a speed of 60.0m/s.
a) How long after being thrown is it 175m above ground?

So i did -
d = V1t + 1/2at^2
175 = 60t + 1/2 (10)t^2 (rearranged and divided it all by 5)
0 = t^2 + 12t - 35
And I can't get the factors.

We were asked to consider acceleration as 10.0m/s^2

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  1. Also..under what conditions will the quadratic be a perfect square?

    I don't understand how to explain it.

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  2. Wouldn't v1 be 0?

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