f(x)=3x²+5x-2,求f(a) f(a+1)

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f(x)=3x²+5x-2,求f(a) f(a+1)
f(x)=3x²+5x-2,求f(a) f(a+1)

f(x)=3x²+5x-2,求f(a) f(a+1)
f(x)=3x²+5x-2
f(a)=3a²+5a-2
f(a+1)=3(a+1)²+5(a+1)-2
=3a²+6a+3+5a+5-2
=3a²+11a+6