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f(x) = 4x² - 2x + c
dicari nilai c
f(5)= 4(5)² - 2(5) + c =36
100 - 10 + c =36
c =36-90
c =-54
maka
f(x)=4x² - 2x + c
f(x)=4x² - 2x - 54