Question

3 of 28 (1 ca core: 0 of 1 pt 1.2.3 X+3 What is the domain of f(x) = x² + 7x-18 Select the correct choice below and, if necessary, fill in the answer box(es) to complete your choice. O A. The domain is {x|3} (Simplify your answer. Type an inequality. Use a comma to separate answers as needed.) O B. The domain is {x | x2 3.x* (Simplify your answer. Use a comma to separate answers as needed.) O C. The domain is {x ** (Simplify your answer. Use a comma to separate answers as needed.) OD. The domain is {xxs (Simplify your answer. Use a comma to separate answers as needed.) E. The domain is the set of all real numbers

Answer 1

at's what is the domain find a X2+72-18 Sol X+3 x²472-18 Factor for a²+ I2-18 - 18X? 2 9x -21 xht 9x=2a-18 X(X + 9) -2(249) (x-2) 12+9) 2+3 (2-2) = cx +a)=0 (x-2)(x+9) X- 20 Na 2 +970 17=-9 Domain IntervalNötation 600,09) U14,2) 012,00) set-builder Notation {x\* # 2-44 :-C The domain is {2 12 + 2,-9}