do with fulllll fulll calculations Find the equations of the two tangents to the circle x2+y2+4x-6y+4=0 if the tangents pass throug the origin.
Question
do with fulllll fulll calculations Find the equations of the two tangents to the circle x2+y2+4x-6y+4=0 if the tangents pass throug the origin.
Solution
The given equation of the circle is x² + y² + 4x - 6y + 4 = 0.
We can rewrite this in the standard form of a circle equation (x - h)² + (y - k)² = r², where (h, k) is the center of the circle and r is the radius.
Comparing the given equation with the standard form, we get:
(x + 2)² + (y - 3)² = r²
This simplifies to:
x² + 4x + 4 + y² - 6y + 9 = r²
Comparing this with the given equation, we find that r² = 9, so r = 3.
The center of the circle is at (-2, 3).
The equation of a line passing through the origin and a point (x1, y1) is y = (y1/x1)x.
Since the tangents pass through the origin, the slopes of the tangents are given by m1 and m2, where m1*m2 = -1 (because the tangents are perpendicular to the radius at the point of tangency).
Let's denote the point of tangency as (x1, y1). The distance from the center of the circle to the point of tangency is equal to the radius, so we have:
(x1 + 2)² + (y1 - 3)² = 9
This simplifies to:
x1² + 4x1 + 4 + y1² - 6y1 + 9 - 9 = 0
x1² + 4x1 + y1² - 6y1 + 4 = 0
The equation of the line passing through the origin and the point of tangency is y = mx, so y1 = m*x1.
Substituting y1 = m*x1 into the equation above, we get:
x1² + 4x1 + (mx1)² - 6mx1 + 4 = 0
This is a quadratic equation in x1, so its discriminant must be zero (since there is only one point of tangency).
The discriminant is (4 - 6m)² - 4(1 + m²) = 0.
Solving this equation for m gives the slopes of the tangents, and substituting these slopes into the equation y = mx gives the equations of the tangents.
Similar Questions
Find the equations of two tangents to the circle x2 + y2 − 6x + 4y − 9 = 0 that are parallel to the line3x + 4y = 6
The locus of the point from which mutually perpendicular tangents can be drawn to the circle2 2 4 6 3 0x y x y i
do these with full calculation steps,show answers.Two tangents are drawn to the circlex2+y2+2x+4y-12 = 0. If the two tangents are perpendicular tothe straight line x-4y-7= 0, find (a) the equations of the two tangents, (b) the coordinates of the point of contact for each tangent found in (a)
The equation of a circle is x2 + y2 + 4x − 2y − 20 = 0. Find:(a) the length of the tangent to this circle from the point (5, 2)
A diameter intersects a circle at the points (6,−4) and (−2, 6).(a) Find the centre and radius of the circle.
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.