Question

Resolva as equações considerando U=R.


a)x^2=121 b) x^2+1=226 c) x^2-1=24/25 d) x^2-7=35

Answer 1

a)x^2=121  ==> x² = 11² ==> x = +/- 11
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b) x^2+1=226  ==> x² = 226-1 ==> x² = 225 ==> x² = 25² ==> x = +/- 25 
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c) x^2-1=24/25 ==> x² = 24 +1 ==> x² = 24+25 ==> x² = +/- 49   
                                       25                         25                       25
 x² = (7)² ==> x = 7
          5                5
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d) x^2-7=35 ==> x²=35+7 ==> x^2=42 ==> x = +/- V42