Question

решите уравнение -9х^2-7х+2=0

Answer 1

D=49+4*9*2=121
x1=(7+11)/ -18 = -1
x2=(7-11)/ -18=4/18=2/9

Answer 2

-9x² -7x + 2= 0 |*(-1)
9x² + 7x - 2=0
D= b² - 4a*c
D= 49 +4*9*2 = 49+72 = 121
x₁ = -7+11/18 = 4/18 = 2/9
х₂= -7 - 11/18 = -18/18  -1
Ответ: -1; 2/9.