Question

Stabiliti daca ecuatiile:
a)x=3 si 5x=15
b)x=1 si 6x+6=0
c)-3x+2x=4 si 2(x+4)=0
d)1/5x-2=0 si 2x+2x=40
e)√3=-x Si 2x+2√3=0
f)/x/=4 si 2x=8
g)x^2=9 si x=-3

Answer 1

Răspuns:

1)

x = 3

5x = 15 => x = 3

sunt egale

2)

x = 1

6x + 6 = 0 => 6x = -6 => x = -1

nu sunt egale

3)

-3x + 2x = 4 => -x = 4 => x = -4

2x + 8 = 0 => 2x = -8 => x = -4

sunt egale

4)

1/5x - 2 = 0 => 1/5x = 2 => x = 10

4x = 40 => x = 10

sunt egale

5)

√(3) = -x => 3 = x²

2x + 2√(3) = 0 => 2√(3) = -2x => 12 = 4x² => 3 = x²

sunt egale

6)

x = 4

2x = 8 => x = 4

sunt egale

7)

x² = 9 => x = 3

x = -3

nu sunt egale