Question

Fie nr nat x=3(1+2+3+...+49)+1225 . Atunci valoarea lui radical din x este

Answer 1

[tex]x=3(1+2+3+...+49)+1225\\ x=3* \frac{49*50}{2}+1225\\ x=3*49*25+1225\\ x=25(3*49+49)=25*4*49\\ \sqrt{x} =2*5*7=70 [/tex]

Answer 2

√x = √(3·49·50:2 + 1225)
√x = √(3675 + 1225)
√x = √4900
√x = √70²
  x = 70