Question

2x2-8x

3x2-12

3x2-4x+2

X2-25

-x2+9=0

X2+5x

Answer 1

2x^2 - 8x =0
2x(x-4)=0
2x=0》x=0/2》x=0
x-4=0》x=4

3x^2 - 12 = 0
3x(x-4)=0
3x=0》x=0/3》x=0
x-4=0》x=4

3x2 -4x + 2 = 0
a=3 b=-4. c= 2
formula delta
delta=b^2-4ac
delta=(-4)^2-4(3)(2)
delta=16 - 12(3)
delta=16 - 36
delta=-20. nao existem raiz tem um negativo

x^2 - 25 = 0
x^2 = 25
x= +,- \/25
x= +,- 5

-x^2 - 9 = 0
-x= \/9
-x=3(-1)
x= -3

x^2 + 5x =0
x(x-5)=0
x=0
x-5=0》x=5