Question

A) k(x) = x2-18
find k (9)


B) find x when f(x)=15

f(x)=2x+7​

Answer 1

Explanation:

k(x) = 2x - 18

k(9) = (2 x9) -18

k(9) = 18-18

k(9) = 0

b

B...f(x) = 15

2x + 7 = 15

2x = 15 - 7

2x = 8

x= 8

2

x= 4

Answer 2

Answer: k(9)=63

f(x)=15= 37

Explanation:

k(x)=x^2-18

k(9)=(9)^2-18

=81-18

k(9) =63

f(x)=2(x)+7

when f(x)=15

f(15)=2(15)+7

=30+7

f(15) = 37