Question

Resolva mentalmente as seguintes equações:
a) x² - 4x + 3 = 0

b) x² + 2x - 3= 0
c) x² + 6x + 9= 0
d) x² - 7x - 8 = 0
e) x² - 7x + 10 = 0
f) x² - 5x - 36 = 0
g) x² + 16x - 36= 0
h) x² - 15x + 36= 0
i) x² + 16x + 64= 0
j) x² - 20x + 64= 0
k) x² - 31x = 0
l) x² - 81 = 0
Me ajudem pfv!!!

Answer 1

Resposta:

$a)x^2-4x+3=0\quad :\quad x=3,\:x=1$

$b)x^2+2x-3=0\quad :\quad x=1,\:x=-3$

$c)x^2+6x+9=0\quad :\quad x=-3$

$d)x^2-7x-8=0\quad :\quad x=8,\:x=-1$

$e)x^2-7x-8=0\quad :\quad x=8,\:x=-1$

$f)x^2-5x-36=0\quad :\quad x=9,\:x=-4$

$g)x^2+16x-36=0\quad :\quad x=2,\:x=-18$

$h)x^2-15x+36=0\quad :\quad x=12,\:x=3$

$i)x^2+16x+64=0\quad :\quad x=-8$

$j)x^2-20x+64=0\quad :\quad x=16,\:x=4$

$k)x^2-31x=0\quad :\quad x=31,\:x=0$

$l) x^2-81=0\quad :\quad x=9,\:x=-9$