jika f(x)= 2x+1, g(x)=5x²+3 dan h(x)=7x maka ( fogoh) (x) = a. 490x²+7 b. 70x²+3 c. 590x³+7 d. 490x² e. 70x²+7

g(f(x)) =5(7x)² + 3= 5(49x²) + 3= 245x² +3

=(fogoh)(x)
= f(g(h(x)))
= 2( 245x²+3) +1
= 490x² + 6 + 1
= 490x²+7. (A)

(f o g o h)(x) = f( g(h(x)) )
Cari g(h(x)) dulu
g(h(x)) = 5 . (7x)²+ 3
g(h(x)) = 5 . 49x² + 3
g(h(x)) = 245x² + 3

f(x) = 2x + 1
f( g(h(x)) ) = 2(245x² + 3) + 1
f( g(h(x))) = 490x² + 6 + 1
( f o g o h)(x) = 490x² + 7 ( A.)


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