Question

Помогите,срочно,очень надо^_^

Answer 1

х2-3х-40=0
Д=9-4*(-40)=9+16=25=5
х1=3-52=-22=-1
х2=3+52=82=4
х2+7х+6=0
Д=49-4*6=49-24=25=5
х1=-7+52=-22=-1
х2=-7-52=-122=-6
х2+6х+9=0
Д=36-4*9=36-36=0
х1=-62=-3
х2=-62=3
х2+3х-54=0
Д=9-4*(-54)=9+216=225=15
х1=-3+152=122=6
х2=-3-152=-182=-9
х2+11х+24=0
Д=121-4*24=121-96=25=5
х1=-11-52=-162=-8
х2=-11+52=-62=-3

Answer 2

755) D = b² - 4ac = (-3)² - (-40)*1*4 = 169
x1 = (-b - √D) : 2 = (3 - 13) / 2 = -5
x2 = (-b + √D) : 2 = (3 + 13) / 2 =  8

756)  D = b² - 4ac = 7*7 - 4*1*6 = 25
x1 = (-b - √D) : 2 = (-7 - 5) / 2 = -6
x2 = (-b + √D) : 2 = (-7 + 5) / 2 =  -1

757)  D = b² - 4ac = 6*6 - 4*1*9 = 0
x = (-b ) : 2 = -6 / 2 = -3

758) D = b² - 4ac = 3*3 - 4*1*(-54) = 225
 x1 = (-b - √D) : 2 = (-3 - 15) / 2 = -9
x2 = (-b + √D) : 2 = (-3 + 15) / 2 = 6

759) D = b² - 4ac = 11*11 - 4*1*24 = 25
x1 = (-b - √D) : 2 = (-11 - 5) / 2 = -8
x2 = (-b + √D) : 2 =  (-11 + 5) / 2 = -3