Question

which of the following functions satisfy f(x)>1 for all real value of x?
f(x)=x^2+2
f(x)=2sinx-2
f(x)=x^3-2
f(x)=I x+2I

Answer 1

@satellite73

Answer 2

since \(x^2\geq 0\) because it is a square, that means
\[x^2+2\geq 2\]

Answer 3

yeh

Answer 4

if it is bigger than two, it is certainly bigger than one

Answer 5

clear enuf right?

Answer 6

so the answer is option 1?

Answer 7

yeah
if you want to be bored, we can check that none of the others work

Answer 8

what about option 4?

Answer 9

\[f(x)=|x+2|\] what is \[f(-2)\]?

Answer 10

0?