Help Frustrated With Math Functions

Im so frustrated I can't seem to figure out these problems. If anyone can't solve these problems it's ok just an effort will be helpful.

1. Let F(x)=x²-4 and G(x)=6-x
Find (F-G)(10)
(F-G)(10)=

2. Let F(x)=x²-7 and G(x)=13-x
Find (F/G)(7)
(F/G)(7)=

3. Let F(x)=x²-14 and G(x)=5-x
Find (F-G)(-4)
(F-G)(-4)=

1. Let F(x)=x²-4 and G(x)=6-x
Find (F-G)(10)
(F-G)(10)=

(10)^2 - 4 - [ 6 - (10)]
= 100 - 4 - 6 + 10
= 100


2. Let F(x)=x²-7 and G(x)=13-x
Find (F/G)(7)
(F/G)(7)=

[(7)^2 - 7] / [13 - 7]
= (49 - 7) / (6)
= 42/6
= 7

3. Let F(x)=x²-14 and G(x)=5-x
Find (F-G)(-4)
(F-G)(-4)=

(-4)^2 - 14 - [ 5 - (-4)]
= 16 - 14 - 5 - 4
= -7

1)
F-G = (x^2 - 4) - (6 - x)
= x^2 + x - 10

(F-G)(10) = (10)^2 + (10) - 10
= 100

2)
F/G = (x^2 - 7) / (13 - x)

(F/G)(7) = (7^2 - 7) / (13 - 7)
= 42 / 6 = 7

3)
F-G = (x^2 - 14) - (5 - x)
= x^2 + x - 19

(F-G)(-4) = (-4)^2 + (-4) - 19
= 12 - 19 = -7