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\left[x \right] = \left[ -1+\frac{\left( -7\right) \,y}{4}\right][x]=[−1+4(−7)y] totally answer
F(1) = -5(1)^2+2(1)+9 = 6
f(2) = -5(2)^2+2(2)+9 = -9
So, because f(1) = 6 is positive and f(2) = -9 is negative, f(1) > f(2).
f(1) is greater than f(2)!