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For the function 
f(x)=-x^(2)-2x+5, find the slope of the secant line between 
x=-4 and 
x=2.
Answer:

For the function f(x)=x22x+5 f(x)=-x^{2}-2 x+5 , find the slope of the secant line between x=4 x=-4 and x=2 x=2 .\newlineAnswer:

Full solution

Q. For the function f(x)=x22x+5 f(x)=-x^{2}-2 x+5 , find the slope of the secant line between x=4 x=-4 and x=2 x=2 .\newlineAnswer:
  1. Calculate y-value for x = 4-4: 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 y-values divided by the change in x-values. This is given by the formula (f(x2)f(x1))/(x2x1)(f(x_2) - f(x_1)) / (x_2 - x_1), where x1x_1 and x2x_2 are the x-values of the two points.
  2. Calculate y-value for x = 22: First, we need to find the y-value for x=4x = -4 by substituting 4-4 into the function f(x)=x22x+5f(x) = -x^2 - 2x + 5. This gives us f(4)=(4)22(4)+5f(-4) = -(-4)^2 - 2(-4) + 5.
  3. Find slope using y-values: Calculating f(4)f(-4) gives us f(4)=(16)+8+5=16+8+5=8+5=3f(-4) = -(16) + 8 + 5 = -16 + 8 + 5 = -8 + 5 = -3.
  4. Identify horizontal secant line: Next, we need to find the yy-value for x=2x = 2 by substituting 22 into the function f(x)=x22x+5f(x) = -x^2 - 2x + 5. This gives us f(2)=(2)22(2)+5f(2) = -(2)^2 - 2(2) + 5.
  5. Determine slope of horizontal line: Calculating f(2)f(2) gives us f(2)=(4)4+5=44+5=8+5=3f(2) = -(4) - 4 + 5 = -4 - 4 + 5 = -8 + 5 = -3.
  6. Determine slope of horizontal line: Calculating f(2)f(2) gives us f(2)=(4)4+5=44+5=8+5=3f(2) = -(4) - 4 + 5 = -4 - 4 + 5 = -8 + 5 = -3.Now we have both yy-values: f(4)=3f(-4) = -3 and f(2)=3f(2) = -3. We can use these to find the slope of the secant line. However, we notice that the yy-values are the same, which means the secant line is horizontal.
  7. Determine slope of horizontal line: Calculating f(2)f(2) gives us f(2)=(4)4+5=44+5=8+5=3f(2) = -(4) - 4 + 5 = -4 - 4 + 5 = -8 + 5 = -3.Now we have both yy-values: f(4)=3f(-4) = -3 and f(2)=3f(2) = -3. We can use these to find the slope of the secant line. However, we notice that the yy-values are the same, which means the secant line is horizontal.The slope of a horizontal line is 00. Therefore, the slope of the secant line between x=4x = -4 and x=2x = 2 for the function f(x)f(x) is 00.

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