(2X-5)^2-36=04x²-20x+25-63=04x²-20x-11=0D = (-20)²-4*4*(-11)=400+176=576=24²x₁ = (20-24)/8 = -1/2= -0.5x₂ = (20+24)/8 = 44/8 = 5.5