1. 4*x^2 - 5x = 1/2, 4*(1/2)^2 - 5 = 4*1/4 - 5 = 1 - 5 = -4
2. y*(-3y +y) - 5*ty = -1, t = 2/5, -1*(-3*(-1) -1) - 5*2/5 = -2 - 2 = -4
1. 4*x^2 - 5
x = 1/2, 4*(1/2)^2 - 5 = 4*1/4 - 5 = 1 - 5 = -4
2. y*(-3y +y) - 5*t
y = -1, t = 2/5, -1*(-3*(-1) -1) - 5*2/5 = -2 - 2 = -4