Question

resolva as equações.
a) X²-3x=0

b)3 X²+12x=0

Answer 1

A-Δ=b²-4.a.c
    Δ=9
 x1=-b+-√Δ/2.a
 x1=3-3/2=0
 x2=3+3/2=3
 

B-Δ=144
x=-12+-12/2.3
x=0/6
x2=-24/6=-4

Answer 2

A) x² - 3x = 0

x • (x - 3) = 0

x= 0

x - 3 = 0

x= 0 + 3

x= 3

S= ( 0 , 3)

B)3x² + 12x = 0

3x • (x + 4) = 0

x= 0

3x + 12 = 0

3x= 0 - 12

3x= - 12

x= - 12/3

x= - 4

S= ( 0 , - 4)