Marcus solved for x in the quadratic equation x2 – 10x + 25 = 0. x = x = x = what is true about marcus’s work? check all that apply. marcus should have substituted –10 for b, not 10. the denominator should be 1, not 2. marcus should have subtracted 4(1)(25) in the square root. this equation, when solved correctly, only has 1 real number solution. this equation has 2 real number solutions.