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Hi nkw, Positive ions = cations, Negative ions = anions Take Sodium Flouride for example: NaF - There is no subscript (xy). This means that the charges are equal and balance out. [the Na+ and the F- balance out] Na2O - Oxygen is 2- (look at where it is on the periodic table) and...

Alrighty Thank you (: x

OMG GUYS CMON HELP A GAL OUT I KNOW YOU SEE THIS I could be of help to you one day.... ):

Acutally nevermind i get it!! :D

So I did y - y_1 = x_1/2a ( x- x_1) then I get 2ay-2ay_1 = x_1x - x_1^2 by expanding then x_1x = 2ay-2ay_1 + x_1^2 but I still cant get x1x = 2a(y+y1)

Thank you again x

:wavey: Hi guys, I''m new here. If anyone has time could you give me a brief intro to how this website works, how I can answer questions, how do I get more rep powers? And all that jazz it would be much appreciated. Cool thanks

Hi Guys, [An alternative proof of the reflection property] P is the variable point (x1, y1) on the parabola x2 = 4ay, and S is the focus. The tangent at P meets the tangent at the vertex of the parabola at Q an it meets the axis of the parabola at R. How do you show that the tangent at P...

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Hi if anyone has time could you please help me out? x The points P(2ap. ap^2) and Q (2aq, aq^2) lie on the parabola D whose equation is x^2 = 4ay. Suppose that A (intersection of the tangents to D at P and Q) lies on the line containing the latus rectum of D. Show that pq=1 HOW CAN...