Сколько.будет 2z^2-13z=-7
2z²-13z+7=0
D=169-56= 113
z1= (13+√113)/4
z2= (13-√113)/4
2z² -13z +7 = 0. D = b²-4ac a = 2, b = -13, c = 7, D = (-13)² - 4×2×7 = 169 - 56 = 113.