Question

Me ajudem pfvr!!!
2) Resolva as equações incompletas:
a) 3x2 + 12x = 0
b) x2 - 64 = 0
c) 4x2 - 16x=0
d) 6x2 + 18x =0
e) x2 - 49 = 0​

Answer 1

a) 3x² + 12x = 0

x. (3x + 12) = 0

x = 0

3x + 12 = 0

3x = -12

x = -12/3

x = -4

S = {0, -4}

b) x² - 64 = 0

x² = 64

x = √64

x = +/- 8

S = {-8, 8)

c) 4x² - 16x = 0

x. (4x - 16) = 0

x = 0

4x - 16 = 0

4x = 16

x = 16/4

x = 4

S = {0, 4}

d) 6x² + 18x = 0

x. (6x + 18) = 0

x = 0

6x + 18 = 0

6x = -18

x = -18/6

x = -3

S = {0, -3)

e) x² - 49 = 0

x² = 49

x = √49

x = -/+ 7

S = {-7, 7}