Question

Resolva as equações incompletas

Answer 1

g
x² + 15 = 27
x² = 27 - 15
x² = 12
Vx² = +-V12 =  V(2².3)  = 
x = +-2V3 ***
h
x² - 169 = 0
x² = 169
Vx² = +-V16 = +-V13²
x = +-13 ****
i
x ( x + 9) = 18 + 9x
x² + 9x - 9x = 18
x² = 18
Vx² = +-V18 = +-V2.3²  
x = +- 3V2 ***
j
x²/3 - 30/1 = 10/1
mmc = 3
x² - 90 = 30
x² = 30 + 90
x² = 120
Vx² = +-V120 =+- V2² . 2 . 3 . 5 )
x = +- 2 V30 ****