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Question

If the line y=mx+a meets the parabola y2=4ax at two points whose abscissa are x1 and x2, then the value of m for which x1+x2=0 is

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Solution

Given line is
y=mx+a (1)
y2=4ax (2)

From equation (1) and equation (2), we get
(mx+a)2=4ax
m2x2+2amx+a2=4ax
m2x2+(2am4a)x+a2=0

Now for x1+x2=0,
Sum of roots =0
2am4am2=0
4a2am=0
Since a0,
m=2

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