Question

va rogg!:
rezolvati in multimea numerelor reale ecuatiile:
ex: 1/81 a) x²=4
b)x²=9
c)x²=144
f)x²=16 supra 25

Answer 1

x^2 = 4
x = radical din 4 
x = { -2;2}

x^2 = 9
x = radical din 9 
x = {-3;3}

x^2 = 144
x = radical din 144
x = { - 12; 12}

x^2 =16/25
x = radical din 16/25 
x = { -4/5; 4/5 } 

Answer 2

a) x²=4
x=±2
x={-2 ; 2}

b) x²=9
x=±3
x={-3 ; 3}

c) x²=144
x²=±12
x={-12 ; 12}

f) x²=16/25
x=±4/5
x={-4/5 ; 4/5}