The function f is defined by f(x)=x3+4−4sin(x2). Use a calculator to write the equation of the line tangent to the graph of f when x=2.5. You should round all decimals to 3 places.Answer:
Q. The function f is defined by f(x)=x3+4−4sin(x2). Use a calculator to write the equation of the line tangent to the graph of f when x=2.5. You should round all decimals to 3 places.Answer:
Calculate Derivative of f: To find the equation of the tangent line to the graph of f at x=2.5, we need to calculate the derivative of f, which will give us the slope of the tangent line at that point. The derivative of f with respect to x is f′(x)=3x2−8xsin(x2)cos(x2) (using the chain rule and product rule for differentiation).
Evaluate Derivative at x=2.5: Now we need to evaluate the derivative at x=2.5 to find the slope of the tangent line at that point. So we calculate f′(2.5)=3(2.5)2−8(2.5)sin((2.5)2)cos((2.5)2). Using a calculator, we find the value of f′(2.5) and round it to three decimal places.
Calculate Slope of Tangent Line: After calculating, we find that f′(2.5)≈3(2.5)2−8(2.5)sin((2.5)2)cos((2.5)2)≈18.750−8(2.5)sin(6.25)cos(6.25)≈18.750−20sin(6.25)cos(6.25). We need to use a calculator to find the exact value of sin(6.25) and cos(6.25) and then multiply by −20 and add to 18.750.
Find y-coordinate at x=2.5: Using a calculator, we find that sin(6.25)≈−0.003 and cos(6.25)≈1.000. Therefore, −20sin(6.25)cos(6.25)≈−20(−0.003)(1.000)≈0.060. Adding this to 18.750 gives us the slope of the tangent line: 18.750+0.060≈18.810.
Write Equation of Tangent Line: Next, we need to find the y-coordinate of the point on the graph of f where x=2.5. We do this by evaluating f(2.5)=(2.5)3+4−4sin((2.5)2). Using a calculator, we find f(2.5) and round it to three decimal places.
Simplify Equation to Slope-Intercept Form: After calculating, we find that f(2.5)≈(2.5)3+4−4sin(6.25)≈15.625+4−4(−0.003)≈19.625+0.012≈19.637.
Simplify Equation to Slope-Intercept Form: After calculating, we find that f(2.5)≈(2.5)3+4−4sin(6.25)≈15.625+4−4(−0.003)≈19.625+0.012≈19.637.Now we have the slope of the tangent line, m=18.810, and a point on the tangent line, (2.5,19.637). We can use the point-slope form of a line, y−y1=m(x−x1), to write the equation of the tangent line. Substituting the values, we get y−19.637=18.810(x−2.5).
Simplify Equation to Slope-Intercept Form: After calculating, we find that f(2.5)≈(2.5)3+4−4sin(6.25)≈15.625+4−4(−0.003)≈19.625+0.012≈19.637.Now we have the slope of the tangent line, m=18.810, and a point on the tangent line, (2.5,19.637). We can use the point-slope form of a line, y−y1=m(x−x1), to write the equation of the tangent line. Substituting the values, we get y−19.637=18.810(x−2.5).Finally, we simplify the equation to get it into slope-intercept form, y=mx+b. We distribute the slope and add 19.637 to both sides to find the y-intercept, b. y=18.810x−18.810(2.5)+19.637.
Simplify Equation to Slope-Intercept Form: After calculating, we find that f(2.5)≈(2.5)3+4−4sin(6.25)≈15.625+4−4(−0.003)≈19.625+0.012≈19.637.Now we have the slope of the tangent line, m=18.810, and a point on the tangent line, (2.5,19.637). We can use the point-slope form of a line, y−y1=m(x−x1), to write the equation of the tangent line. Substituting the values, we get y−19.637=18.810(x−2.5).Finally, we simplify the equation to get it into slope-intercept form, y=mx+b. We distribute the slope and add 19.637 to both sides to find the y-intercept, b. y=18.810x−18.810(2.5)+19.637.After simplifying, we find the equation of the tangent line to be y≈18.810x−47.018+19.637, which simplifies to m=18.8100 (rounded to three decimal places).
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