2x^2-15x+7=0 решите плииииииииииз

Question

2x^2-15x+7=0 решите плииииииииииз

Answer 1

2x^2 -15x + 7 = 0 
D = 225 - 8*7 = 169 = 13^2
x1 = ( 15 + 13)/4 = 7
x2 = (  15 - 13)/4 = 1/2 = 0,5