# Let f(x) = 4x + 3 and g(x) = -2x + 5. Find.(f o g) (5)

QUESTION POSTED AT 29/05/2020 - 01:00 AM

QUESTION POSTED AT 29/05/2020 - 01:00 AM

f(x) = 4x + 3

g(x) = -2x + 5

(f o g) (5) means the function of g when g is a function of 5

(the function of the function concept)

so we need to get g(5) firstly

g(x) = -2x + 5

g(5)= -2(5) + 5 = -5

After that, f(g(5)) = f(-5) = 4(-5) + 3 = -20 + 3 = -17

I hope that helps

g(x) = -2x + 5

(f o g) (5) means the function of g when g is a function of 5

(the function of the function concept)

so we need to get g(5) firstly

g(x) = -2x + 5

g(5)= -2(5) + 5 = -5

After that, f(g(5)) = f(-5) = 4(-5) + 3 = -20 + 3 = -17

I hope that helps

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