Q. For the function f(x)=2x2−2x−1, find the slope of the secant line between x=−2 and x=3.Answer:
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 y divided by the change in x. This is also known as the difference quotient. The formula is (f(x2)−f(x1))/(x2−x1), where x1 and x2 are the x-values of the two points.
Find f(−2): First, we need to find the y-value for x=−2, which is f(−2). We substitute −2 into the function f(x)=2x2−2x−1 to get f(−2)=2(−2)2−2(−2)−1.
Calculate f(−2): Calculating f(−2) gives us f(−2)=2(4)+4−1=8+4−1=11.
Find f(3): Next, we need to find the y-value for x=3, which is f(3). We substitute 3 into the function f(x)=2x2−2x−1 to get f(3)=2(3)2−2(3)−1.
Calculate f(3): Calculating f(3) gives us f(3)=2(9)−6−1=18−6−1=11.
Calculate f(3): Calculating f(3) correctly gives us f(3)=2(9)−6−1=18−6−1=11.
Calculate f(3): Calculating f(3) correctly gives us f(3)=2(9)−6−1=18−6−1=11.
Calculate f(3): Calculating f(3) correctly gives us f(3)=2(9)−6−1=18−6−1=11.Let's calculate f(3) correctly this time. We have f(3)=2(9)−6−1=18−6−1=11.
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