Question

Find g(x) if it is known that g(5a)=20a−9.

Answer 1

Answer: 4x-9

Explanation:

This is very short if you know the answer.

g(5a) means that where ever you see x on the right, you put in 5a

So g(5a) = b(5a)- 9 The 9 does not come into it.

b*5a = 20a Divide by 5a

b*5a/5a = 20a/5a

b = 4

So g(x) = 4x - 9

Answer 2

Explanation:

This is very short if you know the answer.

g(5a) means that where ever you see x on the right, you put in 5a

So g(5a) = b(5a)- 9 The 9 does not come into it.

b*5a = 20a Divide by 5a

b*5a/5a = 20a/5a

b = 4

So g(x) = 4x - 9