Let g be the function defined by g(x) = -x² + 5x. Find g(a + h), g(?a), g(??), a + g(a), and 1 g(a) Step 1 We are given the function g(x) = -x² + 5x, which we will use to first find g(a + h). In other words, we wish to evaluate the given function g at the specific value x = a + h. To do so, we replace each instance of x in the function g with a + h. g(x) = -x² + 5x g(a + h) = a+h 7) ²³ + 5 ( a + h a+h a+h To conclude, find g(a + h). (Note that it is not necessary to simplify the expression found above further, since we are not requested to do so. However, we can if we wish to.) g(a + h) = ? a² - h² - 2ah+5a +5h -a² - 2ah+5a - h² + 5h ?
Step 2 We now repeat a similar process to find g(-a), replacing each instance of x in the function g with -a. g(x) = -x² + 5x 2 g(-a) = -a 7) ². a -a -a² - 5a -a(a + 5) -a + 5 ||
To find g(?a), replace each instance of x in the function g with ?a. g(x) = -x² + 5x 2 ])² + + 5(?a) 9(??) = ([ ||
Find and simplify f(a+h)-f(a) for the following function. f(x) = 5x²15x + 8 Step 1 To find f(a + h) ? f(a) given f(x) = 5x² - 15x + 8, it is easiest to first find both f(a + h) and f(a). We can then utilize the results to write the desired quotient. h We begin by calculating f(a+h). For that, we substitute a + h for x, expand the parentheses, combine like terms, and simplify. f(x) = 5x²15x + 8 f(a+h) = 5(a + h)² ? 15(a + h) + 8 = 5a² + 10ah +5h² - 15a - 15h + 8 (h = 0) 10ah
Next, we determine f(a). Note that no simplification is needed. f(x) = 5x²15x + 8 f(a) 5a² + 8 = I
Consider the following functions. f(x) = = 1; g(x) = x² + 8 X-8 Complete the following statement, given that h = (gof). h(9) = g v f v (9)) g ]× ) X || = 9