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For the function 
f(x)=x^(2)+5x-9, find the slope of the secant line between 
x=-7 and 
x=4.
Answer:

For the function f(x)=x2+5x9 f(x)=x^{2}+5 x-9 , find the slope of the secant line between x=7 x=-7 and x=4 x=4 .\newlineAnswer:

Full solution

Q. For the function f(x)=x2+5x9 f(x)=x^{2}+5 x-9 , find the slope of the secant line between x=7 x=-7 and x=4 x=4 .\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 and 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 f(7)f(-7): First, we need to find the y-value when x=7x = -7 by substituting 7-7 into the function f(x)f(x). So, f(7)=(7)2+5(7)9f(-7) = (-7)^2 + 5(-7) - 9.
  3. Calculate f(7)f(-7): Calculating f(7)f(-7) gives us f(7)=49359=5f(-7) = 49 - 35 - 9 = 5.
  4. Find f(4)f(4): Next, we need to find the y-value when x=4x = 4 by substituting 44 into the function f(x)f(x). So, f(4)=(4)2+5(4)9f(4) = (4)^2 + 5(4) - 9.
  5. Calculate f(4)f(4): Calculating f(4)f(4) gives us f(4)=16+209=27f(4) = 16 + 20 - 9 = 27.
  6. Identify Two Points: Now we have the two points on the function: (7,5)(-7, 5) and (4,27)(4, 27). We can use these to find the slope of the secant line.
  7. Calculate Slope: The slope of the secant line is (f(4)f(7))/(4(7))=(275)/(4+7)(f(4) - f(-7)) / (4 - (-7)) = (27 - 5) / (4 + 7).
  8. Final Result: Calculating the slope gives us (22)/(11)=2(22) / (11) = 2.

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