Q. What is the area of the region bound by the graphs of f(x)=−x2,g(x)=3x−10, and x=0 in quadrant IV?Choose 1 answer:238(C) 316(D) 334
Identify Intersection Points: Identify the points of intersection between the parabola f(x)=−x2 and the line g(x)=3x−10. To find the points of intersection, set f(x) equal to g(x): −x2=3x−10
Solve Equation for x: Solve the equation −x2=3x−10 for x.Rearrange the equation to form a quadratic equation:x2+3x−10=0
Factor or Use Quadratic Formula: Factor the quadratic equation or use the quadratic formula to find the roots.The quadratic factors as (x+5)(x−2)=0, so the roots are x=−5 and x=2.
Determine Root in Quadrant IV: Determine which root is in quadrant IV.Since quadrant IV is where x is positive and y is negative, we only consider the root x=2.
Calculate Area of Region: Calculate the area of the region bound by the graphs and x=0. The area is a trapezoid with vertices at (0,0), (2,0), (2,−4), and (0,−10). The two bases of the trapezoid are on the y-axis and the line g(x), and the height is the distance along the x-axis from x=0 to x=2.
Find Lengths of Bases: Find the lengths of the bases.The length of the base on the y-axis is the y-value of g(x) at x=0, which is g(0)=−10.The length of the base on the line g(x) is the y-value of g(x) at x=2, which is g(2)=3(2)−10=−4.
Calculate Height of Trapezoid: Calculate the height of the trapezoid. The height is the distance between x=0 and x=2, which is 2 units.
Use Area Formula: Use the formula for the area of a trapezoid, A=21(b1+b2)h, where b1 and b2 are the lengths of the bases and h is the height.Substitute the values into the formula:A=21(−10+(−4))(2)
Simplify to Find Area: Simplify the expression to find the area.A=21(−14)(2)A=−14
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