Question

2z^2-9z-5=0

^ -квадрат

Answer 1

2z² - 9z - 5 = 0
D = b² - 4ac = 81 - 4×2×(-5) = 81 + 40 = 121 = 11²
x1 = ( 9 + 11) / 4 = 5
x2 = ( 9 - 11) / 4 = - 0,5

Answer 2

пожалуйста)))