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f(-1)= -2(-1)²+4(-1)-1 = -2-4-1 =-7
f(0)= -2(0)²+4(0)-1 = -0+0-1=-1
f(1)= -2(1)²+4(1)-1 =-2+4-1 = 1
#klo gak slah sih :p