Question

Помогите плиииииз срочно надо

Answer 1

7. в) Д = 16-24 = -8
Г) x^2-7x+12=0
Д = 49-48 = 1. sqrtД = 1
x1= 4. x2 = 3
Д) 7у^2 + 5у -2 =0
Д = 25 + 56 = 81. sqrtД = 9
y1 = 4/14 = 2/7. y2 = -1
E) 9x^2 -8x -1 =0
Д = 64+36 = 100. sqrtД = 10
х1 = 1. х2 = -2/18 = -1/9