Consider the problem of finding the line of symmetry and vertex of the quadratic equation f(x) =x^2-8x+15 what is the error in the solution below? x^2-8x+15=0 x=-8/2 =-8/2=-4 line of symmetry 8^2-8x+15=0 (-4)^2-8(-4)+15=0 16+32+15=0 y=63 (-4,63) vertex a. the solution is correct. b. the line of symmetry should have been 4 instead of –4. c. the vertex is incorrect; it should have been {–4, 53}. d. -4^2 should have been squared as –16 instead of 16.