kasilik kasilik

23-10-2018
Mathematics

contestada

Find the roots of the function
of the function
f(x)= x^2 + 81

A. X = -81i, 81i

B. X = -81, 81

C. X= -9, 9

D. X= -9i, 9i

Respuesta :

24-10-2018

[tex]f(x)=x^2+81\\\\x^2+81=0\qquad|-81\\\\x^2=-81\to x=\pm\sqrt{-81}\\\\x=-\sqrt{(81)(-1)}\ \vee\ x=\sqrt{(81)(-1)}\\\\x=-\sqrt{81}\cdot\sqrt{-1}\ \vee\ x=\sqrt{81}\cdot\sqrt{-1}\\\\\boxed{x=-9i\ \vee\ x=9i}\\\\Answer:\ D.[/tex]

Answer Link

Otras preguntas

Roxi works as a receptionist for an electronics manufacturer. One week she reported that she worked 38.75 hours. The next week she reported 40 1/4 hours. How ma

which of the following servesbas an electron carrier in cellular respiration?

40 Points! Please answer asap

Solve the following proportion problem for x: 14/3x=20/x-5

Need help with number 24 plz!

Please help meeee it’s important :(

Which strategy could be used to solve 15 × 23? (15 + 2) + (15 + 3) = □ (5 + 23) + (10 + 23) = □ (15 × 2) + (15 × 3) = □ (5 × 23) + (10 × 2

Why did manufacturers rely on immigrant women to work in their factories?

Why was trade important to native American cultures

With which of these statements, from sir Gawain and the green knight, does sir Gawain argue that he should be the one to accept the green knight’s challenge? a)