Question

Rezolvati ecuatia:
a) x patrat -4=0 b) -3x patrat +75=0 c)9x patrat -1=0 d) -4x patrat +100=0
e)7x patrat +7=0 f)x patrat +25=0 g) 100x patrat -36=0 h) 8x patrat +32=0 i) x patrat +49=0
E URGENT IMI TREBUIE MAINE!! MULTUMESC :*

Answer 1

a: x²⁻4=0
x²=4+0
x²=4
x=2

Answer 2

a) x^2 = 0+4
x^2 = 4
x= radical din 4 => x = {-2; +2}
b) -3x^2 = -75
inmultesti cu -1
3x^2 = 75
x^2 = 25
x = {-5; +5}
c) 9x^2 = 1
x^2 = 1/9
x = { -1/3 ; +1/3}
d) 4x^2 = 100
x^2 = 25
x= {-5; +5}
e) 7x^2 = -7
x^2 = -7/7
x^2 = -1 => x = multime vida
f) x^2 = -25 
x =  multime vida
g) 100x^2=36 => x^2 = 36/100 => x = { -6/10 ; +6/10}
h) 8x^2 = -32
x^2= -4 => x = multime vida
i) x^2 = - 49
x= multime vida