Given (f+g)(x)=10-3x and (f-g)(x)=5x-14,find f(x) and g(x).
问题描述:
Given (f+g)(x)=10-3x and (f-g)(x)=5x-14,find f(x) and g(x).
答
(f+g)(x)=10-3x
(f-g)(x)=5x-14
两式相加2f(x)=2x-4
f(x)=x-2
所以g(x)=-4a+12
答
f(x)+g(x)=10-3x
f(x)-g(x)=5x-14
f(x)=x-2
g(x)=12-4x