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Kaj

Find the equation of the tangent through a line y = 5x⁴ + 9x⁶ =0 at ( 1,2). Hint : Use derivatives ​

answers: 1
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Answer:

Answer:

The equation of the given curve is y=x

2

−2x+7.

On differentiating with respect to x, we get:

dx

dy

=2x−2

The equation of the line is 2x−y+9=0.⇒y=2x+9

This is of the form y=mx+c.

Slope of the line =2

If a tangent is parallel to the line 2x−y+9=0, then the slope of the tangent is equal to the slope of the line.

Therefore, we have: 2=2x−2

⇒2x=4⇒x=2

Now, at x=2

⇒y=2

2

−2×2+7=7

Thus, the equation of the tangent passing through (2,7) is given by,

y−7=2(x−2)

⇒y−2x−3=0

Hence, the equation of the tangent line to the given curve (which is parallel to line (2x−y+9=0) is y−2x−3=0.

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