Question

me ajudem por favor​

Answer 1

Resposta:

a) S= {2 ; -2}

b) S= {0}

c) S= {0 ; -1/5}

d) S= { √3 ; -√3}

e) S= { 0 ; -5/2}

f) S= { 0 ; 4}

Explicação passo-a-passo:

a)

5x²-20= 0

5x²= 20

x²= 20/5

x²= 4

x= ±√4

x= ±2

S= {2 ; -2}

b)

√2/3x²= 0

x²= 0/ √2/3

x²= 0

x= ±√0

x= ±0

S= {0}

c)

x² + x/5= 0

x(x+1/5)= 0

x'= 0

x''+1/5= 0

x''= -1/5

S= {0 ; -1/5}

d)

7x² -21= 0

7x²= 21

x²= 21/7

x²= 3

x= ±√3

S= { √3 ; -√3}

e)

2x²+5x= 0

x(2x+5)=0

x'=0

2x''+5= 0

2x''= -5

x''= -5/2

S= { 0 ; -5/2}

f)

-x²+4x= 0

x(-x+4)= 0

x'= 0

-x''+4= 0

-x''= -4  .(-1)

x''= 4

S= { 0 ; 4}