Answers

2016-06-29T06:49:49+08:00
Try to look at this.
0
2016-06-29T09:13:01+08:00
9x^2-72=0 9x^2=72 √9x^2=√72 Cancel the exponent of 2 and the index of the square root 9x=√(2)(36) divided by 9 x=√(2)(4) x=positve negative 2√2 Understand it
0