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g(x)=−2(4)−6=−8−6=−14
Then plug g(x) into f(x):
f(x)=3(−14)−7=−42−7=−49
Option 2:
Plug g(x) into f(x):
f(x)=3(−2x−6)−7=−6x−18−7=−6x−25
Finally plug 4 into our current f(x):
f(x)=−6(4)−25=−24−25=−49