Question

Resolva as equações e)7x²-14=0 f)-x²+49=0 g)-25=100x²=0 h)x²-81/4=0

Answer 1

e
7x² - 14 =0
x² - 2 = 0
x² = 2
Vx² = +-V2
x= +-V2
f
-x² + 49 = 0
x² - 49 = 0
x² = 49
Vx² = +-V49
x = +-7 ***
g
-25 = 100x² = 0
25 = -100x²
1 = - 4x²
-4x² = 1
-4x² - 1 = 0
4x² + 1 =
 4x² = -1
x² = -1/4
Vx² =  +- V1/4  = 
x = +- 1/2 ****
h
x² - 81/4 = 0
x² = 81/4
Vx² = +- V81/V4
x = +- 9/2 ***