mr fantastic MHF Hall of Fame Dec 2007 16,948 6,768 Zeitgeist May 15, 2010 #2 johntricklebank said: z= -4+5i Z^3+Az^2+17z-123=0 find the value of A Click to expand... Substitute z = -4 + 5i into the left hand side. Expand, simplify and equate the real and imaginary parts to zero. Solve for A.

johntricklebank said: z= -4+5i Z^3+Az^2+17z-123=0 find the value of A Click to expand... Substitute z = -4 + 5i into the left hand side. Expand, simplify and equate the real and imaginary parts to zero. Solve for A.