Question

Raspundeti la cat puteti.

Answer 1

1a) V28=2V7
2V7-3V7= -V7
b)Mg=V(3*27)=V81=9
c)x^2-6x+9-x^2+6x=9

2a)x^2=64/4
x^2=16
x=V16
x=4 
xapartine {-4,-3,-2,-1,0,1,2,3,4}
b)2x-3=5 
2x=8
x=4 sau 
2x-3= -5
2x= -2
x= -1 deci x apartine {0,1,2,3,4}
c)(x+5)^2=3*12
x^2+10x+25=36
x^2+10x+25-36=0
x^2+10x-11=0
delta=b^2-4ac=100+44=144
x1=(-b+Vdelta)/2a=(-10+12)/2=2/2=1
x2=(-b-Vdelta)/2a=(-10-12)/2= -22/2= -11
x apartine {-11,1}

3a)3V3=27
5V2=50 deci ,mai mare este 5V2 
b)x<6-5
x<1 
x apartine doar lui 0 
c)x^8-1= (x^4-1)(x^4+1) contine 2 factori