What is the lengths of the marked portions?

Marcus needs to rewrite f(x) = x2 + 6x + 4 in vertex form.

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.

Twelve less than a number is at most 20