1) 2*(1/2)^2 - 5*(1/2) = (1/2)*(2/2 - 5) = 1/2 * (-4) = -2;
2) 16*(1/4)^2 - 8*(1/4) = (1/4)*(16/4 - 8) = 1/4 * (-4) = -1;
1) 2*(1/2)^2 - 5*(1/2) = (1/2)*(2/2 - 5) = 1/2 * (-4) = -2;
2) 16*(1/4)^2 - 8*(1/4) = (1/4)*(16/4 - 8) = 1/4 * (-4) = -1;