第二个问和第三个问，求解(求大神解答，附详细过程🌹🌹)
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(2)
f(x+1)
= x^2+1
=(x+1)^2 -2x
=(x+1)^2 -2(x+1) +2
=>f(x) = x^2-2x+2
(3)
f(x)
=2x^2-3x+1
=2(x-1)^2 +(x -1)
g(x-1) = f(x) =2(x-1)^2 +(x-1)
=>
g(x) = 2x^2 +x
g(2)=8+2 =10
f(g(2))
=f(10)
=2(100)-3(10)+1
=200-30+1
=171
f(x+1)
= x^2+1
=(x+1)^2 -2x
=(x+1)^2 -2(x+1) +2
=>f(x) = x^2-2x+2
(3)
f(x)
=2x^2-3x+1
=2(x-1)^2 +(x -1)
g(x-1) = f(x) =2(x-1)^2 +(x-1)
=>
g(x) = 2x^2 +x
g(2)=8+2 =10
f(g(2))
=f(10)
=2(100)-3(10)+1
=200-30+1
=171
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