f(x)=5x²-7x+2
f(1)=5·1²-7·1+2=5-7+2=0
f(-2)=5·(-2)²-7(-2)+2=20+14+2=36
f(4)=5·4-7·4+2=20-28+2= -6.
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f(x)=5x²-7x+2
f(1)=5·1²-7·1+2=5-7+2=0
f(-2)=5·(-2)²-7(-2)+2=20+14+2=36
f(4)=5·4-7·4+2=20-28+2= -6.