Question

Resolva as equações diversas:


a) x2 – 25 = 0

b) 2x2 – 18 = 0

c) x2 – 5x = 0

d) 3x2 – 10x = 0

e) 3x2 -7x +2 = 0

f) x2 – 6x + 9 = 0

g) x2 + 4x + 10 = 0

h) 2x2 – 6x = 0

pfv❤️❤️​

Answer 1

X^2 - 25 =
x^2 = 25
X = -5 e + 5

b) 2x^2 - 18 = 0
2x^2 = 18
x^2 = 9
x= - 3 e 3

c) x^2 - 5x = p
x (x - 5) 0
x= 0
Ou
x - 5 =
x= 5

d) 3x^2 - 10 x =
x(3x-10)=0
x=0
Ou 3x-10=0
3x= 10
x= 10/3

e) 3x^2 - 7x + 2 = 0
3x^2 - x - 6x + 2 = 0
x( 3x-1) - 6x + 2 = 0
x(3x-1) - 2(3x-1)=0
(3x-1) (x-2)=0
3x - 1 = 0
x= 1/3
Ou
x-2=0
x= 2

f) x^2 - 6x + 9 = 0
(x-3) ^2 =0
x - 3 = =
x = 3

g) x^2 + 4x + 10 = 0
— x nao pertence aos números reais

h) 2x^2 - 6x = 0
2x(x-3) = 0
x( x-3)= 0
x= 0
Ou
x-3=0
x= 3