Question

Determinati x=R astfel in cat :
a) 2 supra 3 ( intregul x care este pus dupa fractie )= 2/3x
b) (3x²) = 400
c) ( x+ 1)²= 64
d) 2x²+ 1/8 = 0
e) x la a 4 = 625
f) (x-2)²=3
g) x²+ 6x+ 0 = 1
h) x²+ 6x+8 =0

Answer 1

2/3X=?

(3X)^2=400; 9X^2=400; X^2=400/9; X= rad.(400/9)=20/3

(X+1)^2=64; X+1=rad.64=8;X+1=8; X=8-1=7

2X^2+1/8=0:ad.la ac.numitor, 16X^2+1=0;16X^2=-1;X^2=-1/16,nu are sol.in R

X^4=625; X^4=25 * 25= 5*5*5*5*; X=5

(X-2)^2=3;X^2-4X+4=3:X^2-4X+1=0: ec.gr.II:X1,2=2+-rad3

X^2+6X+0-1=0;X^2+6X-1=0;ec.gr.II; X1,2=-(3+-2rad.2)

X^2+6X+8=0;X1=-5:X2=-1