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For the function 
f(x)=x^(2)+4x-8, find the slope of the secant line between 
x=-6 and 
x=-1.
Answer:

For the function f(x)=x2+4x8 f(x)=x^{2}+4 x-8 , find the slope of the secant line between x=6 x=-6 and x=1 x=-1 .\newlineAnswer:

Full solution

Q. For the function f(x)=x2+4x8 f(x)=x^{2}+4 x-8 , find the slope of the secant line between x=6 x=-6 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-values divided by the change in xx-values. This is also known as the difference quotient. The formula is (f(x2)f(x1))/(x2x1)(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 f(6)f(-6): First, we need to find the y-value for x=6x = -6 by substituting 6-6 into the function f(x)f(x). So, f(6)=(6)2+4(6)8f(-6) = (-6)^2 + 4(-6) - 8.
  3. Calculate f(6)f(-6): Calculating f(6)f(-6) gives us f(6)=36248=4f(-6) = 36 - 24 - 8 = 4.
  4. Find f(1)f(-1): Next, we need to find the y-value for x=1x = -1 by substituting 1-1 into the function f(x)f(x). So, f(1)=(1)2+4(1)8f(-1) = (-1)^2 + 4(-1) - 8.
  5. Calculate f(1)f(-1): Calculating f(1)f(-1) gives us f(1)=148=11f(-1) = 1 - 4 - 8 = -11.
  6. Identify Two Points: Now we have the two points on the function: (6,f(6))=(6,4)(-6, f(-6)) = (-6, 4) and (1,f(1))=(1,11)(-1, f(-1)) = (-1, -11). We can use these points to find the slope of the secant line.
  7. Calculate Slope: The slope of the secant line is (f(1)f(6))/(1(6))=(114)/(1+6)(f(-1) - f(-6)) / (-1 - (-6)) = (-11 - 4) / (-1 + 6).
  8. Calculate Slope: The slope of the secant line is (f(1)f(6))/(1(6))=(114)/(1+6)(f(-1) - f(-6)) / (-1 - (-6)) = (-11 - 4) / (-1 + 6).Calculating the slope gives us (114)/(5)=15/5=3(-11 - 4) / (5) = -15 / 5 = -3.

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