Anyone know the answer to this? http://prntscr.com/8oszs0

Question

solomonzelman · Answer

$\large\color{black}{ \displaystyle f(x)=-5x  }$

when you compress the function vertically by 1/a, you divide by a:

$\large\color{black}{ \displaystyle f(x)=-(5/a)x  }$

and when you reflect across the x-axis, you multiply the entire function times -1.

solomonzelman · Answer

just mutliply the function times -1, and tell me the answer.

anonymous · Answer

3f(3x) = -15/3a)3x ??? No idea how to do this. Like, at all.

anonymous · Answer

@SolomonZelman

solomonzelman · Answer

-(5/a)x times (-1) is (5/a)x.

solomonzelman · Answer

and this is it.

anonymous · Answer

Whoops! I multiplied by 3 for some reason.

solomonzelman · Answer

$\large\color{black}{ \displaystyle f(x)=-5x  }$

when you compress the function vertically by 1/4, you divide by 4:

$\large\color{black}{ \displaystyle {~~~~~~~~}=-(5/4)x  }$

and when you reflect across the x-axis, you multiply the entire function times -1.

$\large\color{black}{ \displaystyle  {~~~~~~~~}=(5/4)x  }$

anonymous · Answer

Gotcha. So would the answer be D, by chance?

solomonzelman · Answer

Yes, it is D.

anonymous · Answer

Thanks!

solomonzelman · Answer

yw