81x^2 - 100 = 0

Asked by AnneS2 12 years ago 4/1/2013 5:14 AM

Last updated by anonymous 12 years ago 4/2/2013 7:31 PM

Answered by CherieS 12 years ago 4/2/2013 7:31 PM

81x^2 - 100 = 0

(9x )(9x ) ( +10)( -10)

(9x+10) (9x-10)

Check:

(9x+10) (9x-10)

(9x)(9x) (9x)(-10) (10)(9x) (10)(-10)

81x2 -90x +90x -100

81x2 -100