f(x)=10x-2√2
f(1)= 10·1 - 2√2= 10 -2√2
f(√2/5)=10·√2/5 -2√2= 2√2 -2√2=0
f(√2 - 1)= 10(√2 - 1) - 2√2=10√2 -10 -2√2= 8√2 -10
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f(x)=10x-2√2
f(1)= 10·1 - 2√2= 10 -2√2
f(√2/5)=10·√2/5 -2√2= 2√2 -2√2=0
f(√2 - 1)= 10(√2 - 1) - 2√2=10√2 -10 -2√2= 8√2 -10