Question #165711

Find the equation of tangent line to the circle x^2+y^2+z^2+5x-7y+2z-8=0,3x-2y+4z+3=0 and the point (-3,5,4)


1
Expert's answer
2021-02-24T06:02:19-0500

x2+y2+z2+5x7y+2z8=x^2+y^2+z^2+5x-7y+2z-8=

(x+52)2+(y72)2+(z+1)2=552(x+\frac{5}{2})^2+(y-\frac{7}{2})^2+(z+1)^2=\frac{55}{2}

This is sphere with center C(52,72,1)C (-\frac{5}{2},\frac{7}{2},-1) and radius 552.\sqrt{\frac{55}{2}}.

Find the equation of the tangent plane to the sphere at the point P(3,5,4).P(-3,5,4).

The radius vector or normal is CP=(0.51.55).CP=\begin{pmatrix} -0.5 \\ 1.5\\ 5 \end{pmatrix}.

A vector in the plane we seek is v=(x+3y5z4).v=\begin{pmatrix} x+3 \\ y-5\\ z-4 \end{pmatrix}.

So, (0.51.55)(x+3y5z4)=0\begin{pmatrix} -0.5 \\ 1.5\\ 5 \end{pmatrix}*\begin{pmatrix} x+3 \\ y-5\\ z-4 \end{pmatrix}=0\Rarr

0.5(x+3)+1.5(y5)+5(z4)=0-0.5(x+3)+1.5(y-5)+5(z-4)=0.

Answer:

The equation of the tangent plane is

1.5y0.5x+5z29=0.1.5y-0.5x+5z-29=0.

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Comments

Assignment Expert
25.02.21, 22:55

Dear Anshika, thank you for leaving a feedback.

Anshika
25.02.21, 10:01

I had wrote there to find equation of tangent line not tangent plane and I also had not understand that how u find -0.5,1.5,5 Very confused. .

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