Answer:-16, -4Step-by-step explanation:x² +20x +100 -36 = 0x² +20x +64 = 0x² -Sx +P =0, where S= sum of roots, P=product of rootsso what 2 numbers have S= -20 and P = 64 , ...that ul be -4, -16or you can use factoring:( x+16) ( x+4) = 0 x+16 = 0 , x= -16x+4 =0, x = -4or you can do quadratic equation, or graph ...