Question

Resolva As Equações
a) 3x-24=x-4 / b) 3x² + 12x - 63 = 0

Answer 1

a= 3x -24 = x-4
    3x -x = -4 + 24
    2x = 20
     x= 20/2
     x = 10

b= 3x² + 12x - 63 = 0
Δ= b²-4.a.c
Δ= 12² - 4 . 3 . (-63)
Δ=144 + 756
Δ=900

x= -b + √Δ / 2.a
x = -12 +√900/ 2.3
x'=-12 + 30 / 6
x'= 18 / 6
x' = 3

x"= -12- 30 / 6
x" = - 42 / 6
x"= -7