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F(x)=sqrt x+12 and g(x)=2 sqrt x, what is the value of (f – g)(144)

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(f-g)(x)=f(x)-g(x)
(f-g)(144)=f(144)-g(144)

f(144)=√144+12=12+12=24
g(144)=2√144=2(12)=24


(f-g)(144)=24-24=0
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