Question

what multiplies to -64 and add to 64

Answer 1

Please stop posting the same question over and over.

Answer 2

(-64)/x + x = 64

x = 8 (4 + √17) and 8( 4 - √17)

See if those two work.

Answer 3

xy = -64 so y = (-64)/x
and y + x = 64