What is:

We are given :

Step 1: factor the part inside square root

The function given inside square root is of quadratic form.

So let us try to factorise it using AC method.

Here A*C = 4*25 = 100

so we have to find factors of 100 that add up to give -20.

the two factors are -10 and -10.

Rewriting the function :

=

=

=

Step 2:

Now we take square root of the factorised form

=

Answer : (2x-5)

all it means is function 3

the final price would be 29.6925

step-by-step explanation:

39.59 minus 25% equals 29.6925