Question

A)X²-64=0
B)X²-81=0
C)X²-0,25=0
D)X²-1=0
E)X²-25=0
F)X²-7X=0
G)X²+5X=0
H)3X²+5X=0
I)5X²+1X=0
J)4X²-9X=0
K)7X²-3X=0
L)2X²-7X=0
M)8X²-5X=0
N)X²-100=0
O)X²-144=0

Answer 1

Vamos là.

A) x² - 64 = 0 , x1 = 8, x2 = -8

B) x² - 81 = 0, x1 = 9, x2 = -9

C) x² - 1/4 = 0, x1 = 1/2, x2 = -1/2

D) x² - 1 = 0, x1 = 1, x2 = -1

E) x² - 25=0, x1 = 5, x2 = -5

F) x² - 7x = 0 , x1 = 0, x2 = 7

G) x² + 5x = 0, x1 = 0, x2 = -5

H) 3x² + 5x = 0, x1 = 0, x2 = -5/3

I) 5x² + x =0, x1 = 0, x2 = -1/5  

J) 4x² - 9x = 0, x1 = 0, x2 = 9/4

K) 7x² - 3x = 0, x1 = 0, x2 = 3/7  

L) 2x² - 7x = 0, x1 = 0, x2 = 7/2

M) 8x² - 5x = 0, x1 = 0, x2 = 5/8

N) x² - 100 = 0, x1 = 10, x2 = -10

O) x² - 144 = 0, x2 = 12, x2 = -12