Question

If f ⁡ ( x ) = x 2 + 2 ⁢ x − 3 and g ⁡ ( x ) = x 2 − 9 , find ( f g ) ⁢ ( 4 ) and ( f + g ) ⁢ ( 4 ) . ( f g ) ⁢ ( 4 ) is , and ( f + g ) ⁢ ( 4 ) is .

(Photo)

Pls help…

Answer 1

3

28

Explanation:

The expression (f/g) (4) is equal to f(4) / g(4).

f(4) = 4^2 + 2*4 - 3 = 16 + 8 - 3 = 21

g(4) = 4^2 - 9 = 16 - 9 = 7

So, (f/g) (4) = 21 / 7 = 3.

The expression (f + g) (4) is equal to f(4) + g(4).

f(4) = 4^2 + 2*4 - 3 = 16 + 8 - 3 = 21

g(4) = 4^2 - 9 = 16 - 9 = 7

So, (f + g) (4) = 21 + 7 = 28.