3.
Which is the inverse of the function f(x) = x2 - 4?

Step-by-step explanation:

The inverse of a function is the reverse of the function.

Switch variables.

Make y as subject.

Add 4 to both sides.

Take the square root on both sides.

= ±

Step-by-step explanation:

Replace f(x) by y

Exchange x and y

Solve for y

Adding 4 to both sides

Taking sqrt on both sides

y = ±

Replacing y by

= ±

step-by-step explanation:

given that there are two triangles j'k'l' and jkl>

the former is got by dilating the second one.

when drawn on a grid, (graph paper) coordinates of vertices of first triangle is

(6,12)j, (9,6)k and (12,9)l

side jk has length = distance between j and k

=

side j'k'=distance between j' and k'

=

ie j'k'l' has sides 1/3 of that of corresponding sides of jkl.

hence scale factor of 1/3 is used to get j'k'l'from jkl