Question

resolva..desde ja agradeço..

a)x²+4x=0
b)x²-16x=0
c)x²-7x=0
d)x²-8x+12=0
e)x²-10x-56=0

Answer 1

a) x (x + 4) = 0
x = 0 ou x + 4 = 0 → x = -4

b) x (x - 16) = 0
x = 0 ou x - 16 = 0 → x = 16

c) x (x - 7) = 0
x = 0 ou x - 7 = 0 → x = 7

d) delta = 64 - 4 . 1 . 12
delta = 64 - 48
delta = 16

x = 8 +- 4/2
x1= 6
x2= 2

e) delta = 100 - 4 . 1 . - 56
delta = 100 + 224
delta = 324

x = 10 +- 18/2
x1 = 14
x2 = - 4