Choose the polar form of the complex number -1 + i.

sqrt2 (cos45° + isin45°)
sqrt2 (cos135° + isin135°)
2(cos45° + isin45°)
2(cos135° + isin135°)

For problems 29 - 31 the graph of a quadratic function y=ax^2 + bx + c is shown. tell whether the discriminant of ax^2 + bx + c = 0 is positive, negative, or zero.