The function f is defined by f(x)=x3+2x+3sin(x2+2). Use a calculator to write the equation of the line tangent to the graph of f when x=−0.5. You should round all decimals to 3 places.Answer:
Q. The function f is defined by f(x)=x3+2x+3sin(x2+2). Use a calculator to write the equation of the line tangent to the graph of f when x=−0.5. You should round all decimals to 3 places.Answer:
Calculate Derivative of f(x): To find the equation of the tangent line at x=−0.5, we first need to calculate the derivative of f(x), which will give us the slope of the tangent line at any point x. The derivative of f(x) is f′(x)=3x2+2+3cos(x2+2)⋅2x (using the chain rule for the sine function).
Evaluate Derivative at x=−0.5: Now we need to evaluate the derivative at x=−0.5 to find the slope of the tangent line at that point.f′(−0.5)=3(−0.5)2+2+3cos((−0.5)2+2)⋅2(−0.5).
Calculate cos(2.25): Using a calculator, we find that: f′(−0.5)=3(0.25)+2+3cos(0.25+2)×(−1)=0.75+2−3cos(2.25)≈2.75−3cos(2.25). Now we calculate the numerical value of cos(2.25) and then the entire expression.
Find y-coordinate at x=−0.5: Assuming the calculator gives us the value of cos(2.25) rounded to three decimal places, we get:cos(2.25)≈−0.628 (rounded to three decimal places).Now we substitute this value into the expression for f′(−0.5):f′(−0.5)≈2.75−3(−0.628)≈2.75+1.884≈4.634.So, the slope of the tangent line at x=−0.5 is approximately 4.634.
Use Point-Slope Form for Tangent Line: Next, we need to find the y-coordinate of the point on the graph of f(x) at x=−0.5 to use it in the point-slope form of the equation of the tangent line.We calculate f(−0.5)=(−0.5)3+2(−0.5)+3sin((−0.5)2+2).
Simplify Equation to Slope-Intercept Form: Using a calculator, we find that:f(−0.5)=−0.125−1+3sin(0.25+2)≈−1.125+3sin(2.25).Now we calculate the numerical value of sin(2.25) and then the entire expression.
Calculate y-intercept: Assuming the calculator gives us the value of sin(2.25) rounded to three decimal places, we get:sin(2.25)≈0.781 (rounded to three decimal places).Now we substitute this value into the expression for f(−0.5):f(−0.5)≈−1.125+3(0.781)≈−1.125+2.343≈1.218.So, the y-coordinate of the point on the graph of f(x) at x=−0.5 is approximately 1.218.
Calculate y-intercept: Assuming the calculator gives us the value of sin(2.25) rounded to three decimal places, we get:sin(2.25)≈0.781 (rounded to three decimal places).Now we substitute this value into the expression for f(−0.5):f(−0.5)≈−1.125+3(0.781)≈−1.125+2.343≈1.218.So, the y-coordinate of the point on the graph of f(x) at x=−0.5 is approximately 1.218.Now we have the slope of the tangent line (m≈4.634) and a point on the tangent line (−0.5,1.218). We can use the point-slope form of the equation of a line to write the equation of the tangent line:y−y1=m(x−x1), where sin(2.25)≈0.7810 is the point on the line.Substituting the values we have, the equation becomes:sin(2.25)≈0.7811.
Calculate y-intercept: Assuming the calculator gives us the value of sin(2.25) rounded to three decimal places, we get:sin(2.25)≈0.781 (rounded to three decimal places).Now we substitute this value into the expression for f(−0.5):f(−0.5)≈−1.125+3(0.781)≈−1.125+2.343≈1.218.So, the y-coordinate of the point on the graph of f(x) at x=−0.5 is approximately 1.218.Now we have the slope of the tangent line (m≈4.634) and a point on the tangent line (−0.5,1.218). We can use the point-slope form of the equation of a line to write the equation of the tangent line:y−y1=m(x−x1), where sin(2.25)≈0.7810 is the point on the line.Substituting the values we have, the equation becomes:sin(2.25)≈0.7811.To write the equation in slope-intercept form (sin(2.25)≈0.7812), we simplify the equation:sin(2.25)≈0.7813
Calculate y-intercept: Assuming the calculator gives us the value of sin(2.25) rounded to three decimal places, we get:sin(2.25)≈0.781 (rounded to three decimal places).Now we substitute this value into the expression for f(−0.5):f(−0.5)≈−1.125+3(0.781)≈−1.125+2.343≈1.218.So, the y-coordinate of the point on the graph of f(x) at x=−0.5 is approximately 1.218.Now we have the slope of the tangent line (m≈4.634) and a point on the tangent line (−0.5,1.218). We can use the point-slope form of the equation of a line to write the equation of the tangent line:y−y1=m(x−x1), where sin(2.25)≈0.7810 is the point on the line.Substituting the values we have, the equation becomes:sin(2.25)≈0.7811.To write the equation in slope-intercept form (sin(2.25)≈0.7812), we simplify the equation:sin(2.25)≈0.7813Finally, we calculate the y-intercept (sin(2.25)≈0.7814):sin(2.25)≈0.7815So, the equation of the tangent line is:sin(2.25)≈0.7816, rounded to three decimal places.
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