At what point is the tangent to the parabola y=x^2-7x+3 parallel to the line 5x+y-3=0?
Question
Answer:
To find the point where the tangent to the parabola
y=x^2 β7x + 3 is parallel to the line 5x+yβ3=0, we need to determine both the slope of the tangent to the parabola and the slope of the given line. If two lines are parallel, their slopes are equal.
First, let's find the slope of the given line 5x+yβ3=0. We can rewrite this line in slope-intercept form (y=mx+b), where
m is the slope:
5x+yβ3=0
y=β5x+3
So, the slope of the given line is
m=β5.
Now, let's find the derivative of the parabola y=x^2 β7x+3 to determine the slope of the tangent line at any point on the parabola.
y=x^2 β7x+3
Take the derivative with respect to x:
dy /dx = 2xβ7
Now, we want to find the x-value(s) where the slope of the tangent line is equal to -5 (the slope of the given line).
So, we set the derivative equal to -5:
2xβ7=β5
Now, solve for x:
2x=β5+7
2x=2
x=1
Now that we have found
x=1, we can find the corresponding
y-coordinate on the parabola:
y=x^2 β7x+3
y=(1)^2 β7(1)+3
y=1β7+3
y=β3
So, at the point (1,β3), the tangent to the parabola y=x^2β7x+3 is parallel to the line 5x+yβ3=0.
solved
general
11 months ago
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