Answers

2015-07-03T19:22:06+08:00
81-4x²=0
81=4x²
√81=√4x²
9=2x all over 2
x=9/2
0
2015-07-04T08:17:00+08:00
1.)81-4x²=0
= 81=4x²
= √81=√4x²
= 9=2x

= 9=2x
2

= 9/2=x

x= 9/2
0