Question

Buna.. sper sa ma ajutati repede :D Multumesc !
1. Rezolvati ecuatiile :
a) 3x² =108
b) x² + 4=5
c) 3x² + 2 = 1² + (-1)²
d) x² + 1 = (√3)²
e) x² = 4 pe 25.

Answer 1

a) 3x² =108
x²=108/3
x²=36
x1=√36=6
x2=-√36=-6

b) x² + 4=5
x²=5-4
x²=1
x1=1
x2=-1

c) 3x² + 2 = 1² + (-1)²
3x²+2=1+1
3x²=2-2
x1=x2=0

d) x² + 1 = (√3)²
x²+1=3
x²=3-1
x²=2
x1=√2
x2=-√2

e) x² = 4/25
x1=√4/25=2/5
x2=-2/5