Question

resolva as equações a seguir usando a formula de bhaskara: a)x²+2x-3=0 b)3x²+5x+2=0 c)7x-x²-6=0 d)2x²+x=1 e)3x²-2x+1=0 f)4x²+12x+9=0

Answer 1

a) Delta = 16
x= -2+4/2 = 2/2 = 1
x= -2-4/2 = -6/2 = -3
S=(-3 ; 1)
b) Delta = 1
x= -5+1/6 = -4/6
x= -5-1/6 = -6/6 = -1
S=(-4/6 ; -1)
c) Delta = 25
x= 7+5/2 = 12/2 = 6
x= 7-5/2 = 1
S=(1 ; 6)
d) Delta = 9
x= -1+3/4 = 2/4 = 0,5
x= -1-3/4 = -4/4 = -1
S=(-1 ; 0,5)
e) Delta = -8
S=(vazio)
f) Delta = 0
x= -12+0/8 = -12/8 = -1,5
x= -12-0/8 = -12/8 = -1,5
S=(-1,5)