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plz repede imi trebuie maine

Plz Repede Imi Trebuie Maine class=

Răspuns :

5.
c) ([tex] 2^{2} [/tex] + [tex] 2^{4} [/tex] + [tex] 2^{6} [/tex] ) . x= [tex] 2^{3} [/tex] + [tex] 2^{5} [/tex] + [tex] 2^{7} [/tex] 

(4+16+64) . x=8+32+128
(20+64) . x=40+128
84 . x = 168
x=168:84
x=2

Sper ca te-am ajutat ,insa nu am stiu a si b...

1. (x+1)(x+2)=72
x^2+2x+x+2-72=0
x^2+3x-70=0
Δ=9+280=289
x1=-3+17/2=14/2=7
x2=-10
2. 3x+2=5(x-2)
3x-5x+2+10=2
-2x=-10
x=5
3. (2^2+2^4+2^6)x=2^3+2^5+2^7
2^2(1+2^2+2^4)x=2^3(1+2^2+2^4)
4x=8
x=2