Answers

  • Brainly User
2016-07-09T14:19:50+08:00
1) x² = 16
     \sqrt{ x^{2} } = \sqrt{16}
    x = +4, -4

2)  \sqrt{ t^{2} } = \sqrt{81}
    t = +9, -9

3) r² = 100
     \sqrt{ r^{2} } = \sqrt{100}
    r = +10, -10

4) x² = 144
     \sqrt{ x^{2} }  =  \sqrt{144}
    x = + 12, -12

5) 2s²/2 = 50/2
    s² = 25
     \sqrt{ s^{2} } = \sqrt{25}
    s = + 5, -5
2 3 2
why is there a negative answer?! its obviously positive!
Learn the basics of radical expression and you'll know why.
Then, bring your case again here. You should have just ask me "Why is there a negative answer?", and leave the "it's obviously positive!" exclamatory sentence. Have a great day and enjoy learning.
2016-07-09T14:21:48+08:00
 
1. x² = 16
  √x² = √16
     x = 4

2. t² = 81
  √t² = √81
    t = 9

3. r² -100 = 0
    r²         = 100
  √r²         = √100
    r          = 10
    r = 10

4.  x² -144 = 0
     x²         = 144
   √x²         = √144
     x          = 12
     x = 12



5. 2s² = 50
     \frac{2s ^{2} }{2}  \frac{50}{2}
   √s² = √25
     s  = 5
     s=5




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