Math

81x^2 -1 = 0

Asked by AnneS2 on 01 Apr 05:01

Last updated by anonymous on 03 Apr 20:13

1 Answers

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Answered by CherieS on 03 Apr 20:13

81x^2 -1 = 0

(9x )(9x ) ( +1)( -1)

(9x+1)(9x-1)=0

Check:

(9x+1)(9x-1)

(9x)(9x) (9x)(-1) (1)(9x) (1)(-1)

81x^2 -9x +9x -1

81x^2 -1

Simplify:

(9x+1)=0

Solve:

(9x+1)=0

9x+1-1=0-1

9x=-1

9x/9=-1/9

x=-1/9

Simplify:

(9x-1)=0

9x-1+1=0+1

9x=1

9x/9=1/9

x=1/9