(-4,8) is dilated with the center of dilation at the origin, the image of the point is (-18, 36). what is the scale factor of this dilation

4.5

Step-by-step explanation:

You have to divide the x of the dilation image by the x of the pre-image to get our answer and to double-check, you can also do that to the y value.

to get

To make sure you are right, you can multiply the pre-image point by 4.5 and it will get you your image.

Hope this helps.

hello from mrbilldoesmath!

answer:

25x^2 + 90x + 84

discussion:

mn(x) = m(n(x)) = m( 5x + 9) =

(5x + 9)^2 + 3 =>

25x^2 + 90x + 9^2 + 3 =

25x^2 + 90x + 84                 (as 9^2 = 9*9 = 81)

which is the second choice

regards,  

mrb

p.s.   i'll be on vacation from friday, dec 22 to jan 2, 2019. have a great new year!