Question

Ma puteti.ajuta la Testul 1 si Testul 2
Vq multumesc ! ### Vreau doar sa ma verific $$$$

Answer 1

TESTUL 1
1) a) x²=7
x=√7
b) 2x²=98
x²=98:2
x²=49
x=√49
x=7
c) x²= -2

2) 69-5(x-2)²=24
5(x-2)²=69-24
5(x-2)²=45
(x-2)²=9
x-2=+3 ( aici sub + vine - )
        -
x-2=3 --> x1=5
x-2= -3 --> x2= -1

3) Aici nu stiu, scuze. 

4) x²=(1+101)*50/2=102*25
x²=2550
√x²=√2550
/x/=5√51  ⇒x∈{5√51, -5√51}

5) 2X+3≠0⇒x≠-3/2
2x-3≠o⇒x≠3/2
~Aducem la acelasi numitor~
(x-2)(2x-3)+(x+2)(2x+3)=4(4x²-9)
2x²-2x-3x+6+2x²+4x+3x+6=16x²-36
4x²+12=16x²-36
12x²=48
x²=4
x1,2=+,- √4=+,-2

6) Nici aici nu stiu.