Question

Determine as raizes pela soma do produto

a)x²-5x+6=0
b)x²+8x+15=0
c)x²-6x+5=0
d)x²-x-6=0
e)x²-11x+28=0
f)x²-x-12=0

Answer 1

a) a=1 b= -5 c= 6
delta= (-5)² - 4x1x6
delta= 25- 24
delta = 1
X'= 6/2 = 3
X"= 4/2 = 2

b) 8² - 4x1x15
delta =64-60 =4
X' =-8+2/2 =-6/2 = -3
X" = -8-2/2 = -10/2 = -5

c) delta = (-6)² - 4x1x5 =36 - 20 =16
X' = 6+4/2 = 10/2 = 5
X" = 6-4/2 = 1

d) (-1)² - 4x1x(-6)= 25
X' = 1+5 /2 = 6/2 = 3
X" = 1-5 /2 = -4/2 = -2

e) DELTA = ( -11)² - 4x1x28= 121-112 =9
X' =11+3/2=14 /2 = 7
X" = 11-3/2 = 8 /2 =4

F) DELTA = (-1)² - 4x1x(-12) = 49
X'= 1+7/2 = 8/2 = 4 
X"= 1-7/2 = -6/2 = -3
 Espero ter ajudado!