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Question

The tangent to the curve y = e2x at (0, 1) cuts x-axis at the point __________________.

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Solution


The given curve is

y = e2x

Differentiating both sides with respect to x, we get

dydx=2e2x

∴ Slope of tangent at (0, 1) = dydx0,1=2e2×0=2×1=2 .....(1)

So, the equation of tangent at (0, 1) is

y-1=dydx0,1x-0

y-1=2x [Using (1)]

2x-y+1=0 .....(2)

This tangent cuts the x-axis where y = 0.

Putting y = 0 in (2), we get

2x-0+1=0

x=-12

So, the coordinates of the required point are -12,0.

Thus, the tangent to the given curve y = e2x at (0, 1) cuts the x-axis at -12,0.


The tangent to the curve y = e2x at (0, 1) cuts x-axis at the point -12,0 .

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