If y=1-2x is a tangent to x^2 = 4ay, find a and the point of contact. Thanks, btw I found a = -1/4
enigma_1 ~~~~ Miss Cricket ~~~~ Joined Feb 27, 2013 Messages 4,281 Location Lords Gender Female HSC 2014 Dec 19, 2013 #1 If y=1-2x is a tangent to x^2 = 4ay, find a and the point of contact. Thanks, btw I found a = -1/4
B braintic Well-Known Member Joined Jan 20, 2011 Messages 2,137 Gender Undisclosed HSC N/A Dec 19, 2013 #2 Hyper_bole said: If y=1-2x is a tangent to x^2 = 4ay, find a and the point of contact. Thanks, btw I found a = -1/4 Click to expand... Sub in a=-1/4 to get x^2=-y, then solve simultaneously with y=1-2x
Hyper_bole said: If y=1-2x is a tangent to x^2 = 4ay, find a and the point of contact. Thanks, btw I found a = -1/4 Click to expand... Sub in a=-1/4 to get x^2=-y, then solve simultaneously with y=1-2x
A alficio New Member Joined May 9, 2013 Messages 15 Gender Undisclosed HSC N/A Dec 19, 2013 #3 differentiate x^2=4ay against x. 2x = 4a*dy/dx dy/dx = x/2a But dy/dx = -2 Solve for x since you know a .....etc.
differentiate x^2=4ay against x. 2x = 4a*dy/dx dy/dx = x/2a But dy/dx = -2 Solve for x since you know a .....etc.
