x^2 -x - 20 = 0
(x + 4)(x - 5) = 0
x + 4 = 0 or x - 5 = 0
x = -4 or x = 5
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If that's x2 times 20 = 0, then x = 0, because only 0 x 20 = 0
4, -5
x2 - x = 20 x = 5
xy = 20 x+y=9 x=9-y y(9-y) = 20 9y-y(squared) = 20 0= y(squared)-9y+20 0= (y-5)(y-4) y= 5 or 4, x= 5 or 4 The two numbers are 5 and 4.
Let x = the number x^2 + x = x x^2 = 0 x = 0