Q. What is the area of the region between the graphs of f(x)=x+10 and g(x)=x−2 from x=−10 to x=6 ?Choose 1 answer:(A) 364(B) 160(C) 3320(D) 128
Set up integral bounds: To find the area between the two curves, we need to set up an integral from the lower bound of x=−10 to the upper bound of x=6. The area A can be found by integrating the difference between the two functions over this interval.
Determine function order: First, we need to determine which function is above the other in the interval from x=−10 to x=6. Since f(x)=x+10 is always positive or zero and g(x)=x−2 can be negative or positive, we can conclude that f(x) is above g(x) for the entire interval.
Calculate integral: The area A between the two curves is given by the integral from −10 to 6 of (f(x)−g(x))dx, which is the integral from −10 to 6 of (x+10−(x−2))dx.
Integrate x+10: Now we calculate the integral:A=∫−106(x+10−(x−2))dxThis requires us to integrate term by term.
Integrate x−2: First, we integrate x+10 with respect to x from −10 to 6. The antiderivative of x+10 is 32(x+10)23.
Evaluate antiderivatives: Next, we integrate (x−2) with respect to x from −10 to 6. The antiderivative of (x−2) is (1/2)⋅x2−2x.
Evaluate x+10: Now we evaluate the antiderivatives at the bounds x=6 and x=−10 and subtract the lower bound from the upper bound for each term.For x+10, we have [32⋅(6+10)23]−[32⋅(−10+10)23].For (x−2), we have [21⋅62−2⋅6]−[21⋅(−10)2−2⋅(−10)].