Factor the first two terms and the last two terms Take out the common factor (x-2): Write +16 as -(-16) Since the square roots of -16 are 4i and -4i we can factor x²+(-16) as the difference of squares: Set each factor = 0 to find the zeros: x-2=0; x-4i=0; x+4i=0 x=2; x=4i; x=-4i Edwin
Here's your completed problem as I promised. Edwin