Question

Based on the graph of the function f, what are the values of x for which $f\left(x\right)$ is positive?

• A. $-2\le x<1$ or $8<x\le 10$
• B. $-2\le x<1$ or $4<x<8$
• C. $1<x<4$ or $8<x\le 10$
• D. $-2\le x\le 10$
• E. $1<x<8$

Answer 1

Answer: (C)

$1<x<4$ or $8<x\le 10$

Here value of $f\left(x\right)$ is the value of $y$

$\Rightarrow$ for $1<x<4$, the value of $y$ is positive

And for $x>8$ and $x\le 10$, the value of $y$ is positive

Hence, option C is correct.