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For the function 
f(x)=x^(2)+4x-1, find the slope of the secant line between 
x=-3 and 
x=-1.
Answer:

For the function f(x)=x2+4x1 f(x)=x^{2}+4 x-1 , find the slope of the secant line between x=3 x=-3 and x=1 x=-1 .\newlineAnswer:

Full solution

Q. For the function f(x)=x2+4x1 f(x)=x^{2}+4 x-1 , find the slope of the secant line between x=3 x=-3 and x=1 x=-1 .\newlineAnswer:
  1. Slope Formula: To find the slope of the secant line between two points on a function, we use the formula for slope, which is the change in yy divided by the change in xx (rise over run). This is given by f(x2)f(x1)x2x1\frac{f(x_2) - f(x_1)}{x_2 - x_1}, where x1x_1 and x2x_2 are the xx-values of the two points.
  2. Find yy for x=3x=-3: First, we need to find the yy-value for x=3x = -3 by substituting 3-3 into the function f(x)=x2+4x1f(x) = x^2 + 4x - 1. This gives us f(3)=(3)2+4(3)1=9121=4f(-3) = (-3)^2 + 4(-3) - 1 = 9 - 12 - 1 = -4.
  3. Find yy for x=1x=-1: Next, we need to find the yy-value for x=1x = -1 by substituting 1-1 into the function f(x)=x2+4x1f(x) = x^2 + 4x - 1. This gives us f(1)=(1)2+4(1)1=141=4f(-1) = (-1)^2 + 4(-1) - 1 = 1 - 4 - 1 = -4.
  4. Identify Two Points: Now we have the two points on the function: (3,f(3))=(3,4)(-3, f(-3)) = (-3, -4) and (1,f(1))=(1,4)(-1, f(-1)) = (-1, -4). We can see that the yy-values for both points are the same, which means the slope of the secant line is 00 because there is no change in yy.
  5. Calculate Slope: The slope of the secant line is therefore (f(1)f(3))/(1(3))=(4(4))/(1+3)=0/2=0(f(-1) - f(-3)) / (-1 - (-3)) = (-4 - (-4)) / (-1 + 3) = 0 / 2 = 0.

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