Algebra I Help, PLEASE?

Question

Please show work, thanks to all!

1.) Without drawing the graph od the given equation, determine
a.) how many x-intercepts the parabola has
b.) weather its vertex lies above, below, or on the x-axis
y=-x^2+2x-1

2.) Solve, leaving in simplest radical form.
x^2+8x=-16

3.) Solve, leaving in simplest radical form.
3x^2=2x+5

4.) x varies directly as the square of s and inversely as t
a.) How does x change when s is doubled?
b.) When both s and t are doubled?

Answer 1

2) get everybody on the same side - - - so add 16 to both sides

x^2 + 8x + 16 = 0
(x + 4)^2

3) same advice

Answer 2

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they will answer your questions :)