Question

Resolva as equações a seguir:

A) x2-4X-96=0

B) x2-2X-48=0

C) 4x2-4X-35=

D) 9x2-18X-7=0

Answer 1

x² - 4x - 96 = 0
delta = b² - 4ac = 16 + 384 =400 ou +-V400 = -20 ****

x = ( 4 +-20)/2
x1 = 24/2 = 12 ***
x2 = -16/2 = -8 ***

x2 - 2x - 48 = 0
delta =b² -4ac = 4 + 192 = +-V196 = +- 14

x = ( 2 +-14)/2
x1 =16/2 = 8 ***
x2 = -12/2 = -6 ***

4x² - 4x - 35 = 0
delta = 16 + 560 = +-V576 = +-24

x = ( 4 +-24)/8
x1 = 28/8 = 7/2 ***
x2 = -20/8 =-5/2 ****

9x² -18x - 7 = 0
delta = 324 + 252 = 576 ou +-V576 = +-24

x = ( 18 +- 24 )/18
x1 = 42/18 =7/3 ***
x2 = -6/18 = - 1/3 ***