Răspunsuri

2014-04-14T15:24:18+03:00
A)  x^2+3^2=5^2 ----> x^2+9=25 => x^2=16 --> x=4
b)  25^2-x^2=7^2 -----> 625 - x^2=49 => x^2=625-49=576 --> x= \sqrt{576} =24
c)  13+2x^2+x^2-12 ---->13-12 +2x^2 +x^2 = 1+ 2x^2 +x^2