Question

Determine o valor de delta:
a)-x²+7x-9=0
b)-2x²-8x+3=o
c)3x²+x-4=0
d-2x²-2x-5=0

Answer 1

a) - x^2 + 7x -9 = 0
      a = -1
      b= 7
      c= -9
delta= 7^2 - 4. (-1)(-9)
delta = 49 - 36
delta = 13
b) -2x^2 -8x + 3 = 0
      a= -2
       b= -8
       c= 3
delta = (-8)^2 - 4. (-2) . 3
delta = 64 + 24
delta = 88
c) 3x^2 + x - 4 = 0
a= 3
b = 1
c= -4
delta = 1^2 - 4.3.(-4)
delta = 1 + 48
delta = 49
d) 2x^2 - 2x - 5 = 0
a= 2
b=-2
c= -5
delta = (-2)^2 - 4.2 (-5)
delta = 4 + 40
delta = 44