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f(x)=2x^2-3
f(-1/2)
f(-1/2)=2*(-1/2)^2-3
f(-1/2)=-2.5
f(3)
f(3)=2*(3)^2-3
f(3)=15
f(0)
f(0)=2*(0)^2-3
f(0)=-3