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If f(x) = 8 – 10x and g(x) = 5x + 4, what is the value of (fg)(–2)?

User Xxxbence
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5 votes

Answer:

(fg)(-2) = 18

Explanation:

f(x) = 8 – 10x

g(x) = 5x + 4

To find (fg)(-2) or f(g(-2)), first let's find g(-2) by subbing -2 in for x in g(x):

g(x) = 5x +4

g(-2) = 5(-1) +4 = -5+4 = -1

Knowing g(-2)=-1, we can now find f(g(-2)) by subbing -1 in for x in f(x):

f(x) = 8 – 10x

f(-1) = 8 - 10(-1) = 8+10 =18

User Ganeshragav
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