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Question

If y=mx+c touches the parabola y2=4a(x+a), then

A
c=am
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B
c=am+am
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C
c=a+am
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D
none of these
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Solution

The correct option is B c=am+am
Equation of tangent to given parabola having slope m is
y=m(x+a)+am
or y=mx+am+am(i)
Comparing equation (i) with y=mx+c, we have
c=am+am

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