Question

Y²+4Y-21=0
6x²-5x+1=0
K²+12k+36=0
Y²- 4y+5=0
15x²-8x+1=0

Answer 1

y²+4y-21=0
a=+1 b=+4 c=-21
delta = (+4)²-4(+1)(-21)
delta = 16+84 = 100
Raiz de delta= 10
y = -4+/-10 = -6/2 = -3
2 14/2 = 7

6x²-5x+1=0
a=+6 b=-5 c=+1
delta = (-5)²-4(+6)(+1)
delta = +25-24 = 1
Raiz de delta = 1
x = +5+/-1 = 6/12 = 3/6
12 4/12 = 2/6

k²+12k+36=0
a=+1 b=+12 c=+3