Math

Factor and check: z^2 -9z+20=0

Asked by AnneS2 on 12 Sep 03:26

Last updated by anonymous on 13 Sep 11:41

1 Answers

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Answered by CherieS on 13 Sep 11:41

z^2 -9z+20=0

(z )(z ) ( -5)( -4)=0

(z-5) (z-4) = 0

Check:

(z-5) (z-4) = 0

(z)(z) (z)(-4) (-5)(z) (-5)(-4)=0

z^2 -4z -5z +20=0

z^2 -9z +20=0