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Verified answer
Fungsif(4)
= 4² - 5(4) + 2
= -4 + 2
= -2
f(1)
= 1² - 5(1) + 3
= -1
f(4) -f(1)
= -2-(-1)
= - 1
= 16-20+2
= - 2
f(1)=1²-5(1)+2
=1-5+2
= - 2
f(4)-f(1)
=-2-(-2)
=-2+2
=0