Question

resolva as seguintes equaçoes incompleta  6x²-24=0           8x² -4x=0                2x² -5x=0         8x² =0        7x² =0

Answer 1

  6x²-24=0          
6x²= 24
x²=24/6
x²= 4
x= +/- √4
x= -2, 2
S: {-2,2}

8x² -4x=0              
4x(2x-1)=0
4x=0 
x=0
x= 1/2
S:[0,1/2]

 2x² -5x=0        
x(2x-5)=0
x=0
x= 5/2
S:[0, 5/2]

8x² =0    
x²=0/8
x=0 

 7x² =0
x²=0/7
x= 0

Answer 2

$6x^2-24=0 \\ 6x^2=24\\ x^2=24/6\\ x^2=4\\ x= \sqrt{4} \\ x=2$

$8x^2 -4x=0 \\ x(8x-4)=0\\ x=0\\ 8x-4=0\\ 8x=4\\ x= \frac{4^:^2}{8^:^2} \\ x= \frac{2^:^2}{4^:^2} \\ x= \frac{1}{2}$

$2x^2 -5x=0\\ x(2x-5)=0\\ x=0\\ 2x-5=0\\ 2x=5\\ x= \frac{5}{2}$

$8x^2 =0\\ x^2=0:8\\ x^2=0\\ x= \sqrt{0}\\ x=0$

$7x^2 =0\\ x^2=0:7\\ x^2=0\\ x= \sqrt{0}\\ x=0$