Which expressions represent a difference of squares?
0
25x2 - 36
49x2 + 4
0
0
0
4x2 - 12x + 9
3x2 - 9
1 - 16x2

Step-by-step explanation:

for this pair of functions g(x)=x-2 and f(x)=|x| is (g o f)(a)= |a| -2

step-by-step explanation:

g(x)=x-2

f(x)=|x|

(g o f)(a)=?

(g o f)(x)=g(f(x))

(g o f)(x)=g(|x|)

(g o f)(x)=|x|-2

(g o f)(a)=|a|-2

just sum

10 + 10 = 20