blain010908 blain010908 25-05-2023 Mathematics contestada which quadratic equations are in standard form. 1-7x^2=-x. 1/2x^2+4x-3=0. x^5-3x+9=0. 0.5x^2-3.2x+5.8=0. (x+5)^2-3=0. -x^2-3x+20=0.