Question

RESOLVA AS SEGUINTES EQUAÇÕES DO 2º GRAU:

A) 2x² - 7x + 6 = 0
B) x² - 8x + 15 = 0
C) x² + 10x + 25 = 0
D) 3x² + 4x + 1 = 0
E) 5x² + 3x - 2 = 0
F) - x² + 12x - 20 = 0
G) 6x² + 3x + 7 = 0
H) x² + 5 + 5 = 0
I) x² - x - 2 = 0
J) x² - 4x + 7 = 0
L) 5x² + 15x + 10 = 0
M) 2x² - 12x + 16 = 0
N) x² - 18x + 45 = 0
P) x² + 5x + 4 = 0
Q) 7x² + x +2 = 0
R) 2x² + 5x - 3 = 0
S) 6x² + x - 1 = 0
T) 2x² + 3x + 1 = 0
U) x² - 18x + 45 = 0
V) - x² - x + 30 = 0
X) x² - 6x + 9 = 0
Y) x² - 3x + 10 = 0
Z) 5x² + 6x + 3 = 0

Answer 1

a) 2x²-7x+6, a=2,b=-7,c=6

x= 7+- V49-48/4 , 7+-1/4 ,  x= 2, x"= 3/2 S={2,3/2}

b)x²-8x+15, a=1,b=-8,c=15
x= 8+-V64-60/2,  8+-V4/2, 8+2/2=10/2=5, 8-2/2= 6/2=3 S={5,3}

c)x²+10x+25,  a=1, b=10, c=25

x= -10+-V 100-100/2,  -10+-V0/2 , x= -10+0/2= -10/2=-5  S{-5,-5}
(x) as outras são todas da mesma forma, aplique a báskara,ok.