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B²-4ac

9²-4(1)(20)

81-80

1

d>0

2 real and unequal roots

9²-4(1)(20)

81-80

1

d>0

2 real and unequal roots

x2-9x+20=0

These numbers are -5 and -4

x2-9x+20=0 (x-5)(x-4)=0

Now solve for "x" (x-5)(x-4)

either (x-5)=0 or (x-4)=0

if (x-5)=0,then x=5

if (x-4)=0,then x=4

answer:x=5 or x=4